Can't find my mistake

Question

I am writing a user creation script and just working through my variables at this point.  So i have the script importing a csv file with user info.  Based on that user info it creates a series of variables three of which i am using the switch command
to choose the string that is associated with another string.  that all seems to work fine however when the message to type the $dept variable.  the read-host is showing the $upn of the first user to go through not the user that it is actually setting
the variable for.  like i said the variables seem to be setting properly just the output in the shell shows the wrong upn for what i am updating.. code and output below:         
function TFX-CreateNewUsers{
       [CmdletBinding()]
        param(
            [string]$logfile = 'c:\PowerShell_Logs\UserCreationErrors.txt',
            [Switch]$LogErrors,
            [Parameter(Mandatory = $true,
                       valuefrompipeline = $true,
                       HelpMessage = "Please provide valid path and file name to the CSV file with the user information.")]
            [Alias('csv')]
            [string]$FilePath
        $date = Get-Date -Format g
        $addn = (Get-ADDomain).DistinguishedName
        $dnsroot = (Get-ADDomain).DNSRoot
        $userlist = Import-Csv $FilePath
        $userlist | ForEach-Object{
              If (($_.GivenName -eq '') -Or ($_.LastName -eq ''))
                   {Write-Host 'ERROR: Please provide valid GivenName, LastName and Initials. Processing stopped' -ForegroundColor Red
                   "$date ERROR: Please provide valid GivenName, LastName and Initials. Processing stopped" | Out-File $logfile -Append
                   Break
              Else {
                   $upn="[email protected]"
                   $site=$_.site
                      switch ($site) {
                          Arl {$homed = "\\share\global\home\medical\na\arl"}
                          Ash {$homed ="\\share2\user"}
                      switch ($site) {
                          Arl {$HDrive = "H:"}
                          Ash {$HDrive ="U:"}
                      switch ($Site) {
                        Arl {$ou="OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt"}
                        Ash {$dept = Read-Host "Enter Asheboro Department for $upn. Accounting, Engineering, Human Resources, Information Technology, Manufacturing, or Quality Assurance"
                             $ou="OU=$dept,OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt"}
                   $First=$_.GivenName
                   $last=$_.LastName
                   $sam=$first.substring(0,1) + $last
                   $Office=$_.OfficeName
                   $description=$_.Description
                   $street=$_.StreetAddress
                   $city=$_.City
                   $zip=$_.postalcode
                   $state=$_.state
                   $Company=$_.Company
                   $Dept=$_.Department
                   $Title=$_.title
                   $mail=$upn
                   $phone=$_.phone
                   $manager=$_.manager
                   $Location=$_.Country
                   $pass=$_.Password
                   $expires=$_.passwordneverexpires
                   $Enabled=$_.Enabled
                   $setpass = ConvertTo-SecureString -AsPlainText $pass -force
                   $display="$last, $first"
                   Write-Verbose "$sam,$HomeD,$HDrive,$OU,$phone,$site"
Output when showing my variables and asking for the dept
VERBOSE: SRogers3,\\share\global\home\medical\na\arl,H:,OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt,ARL
Enter Asheboro Department for [email protected] (This should be the user below). Accounting, Engineering, Human Resources, Information Technology, Manufacturing, or Quality Assurance: asdf
VERBOSE: EScott,\\share2\user,U:,OU=asdf,OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt,,ASH

Answer 1

I restructured this and removed some subtle mistakes.  The layout should also be easier to debug.
function TFX-CreateNewUsers{
[CmdletBinding()]
param(
[string]$logfile='c:\PowerShell_Logs\UserCreationErrors.txt',
[Switch]$LogErrors,
[Alias('csv')]
[Parameter(Mandatory = $true,
valuefrompipeline = $true,
HelpMessage = "Please provide valid path and file name to the CSV file with the user information."
)][string]$FilePath
$date = Get-Date -Format g
$addn = (Get-ADDomain).DistinguishedName
$dnsroot = (Get-ADDomain).DNSRoot
Import-Csv $FilePath |
ForEach-Object{
If($_.GivenName -eq '' -Or $_.LastName -eq ''){
Write-Host 'ERROR: Please provide valid GivenName, LastName and Initials. Processing stopped' -ForegroundColor Red
"$date ERROR: Please provide valid GivenName, LastName and Initials. Processing stopped" | Out-File $logfile -Append
}else{
$First=$_.GivenName
$last=$_.LastName
$sam=$first.substring(0,1) + $last
$Office=$_.OfficeName
$description=$_.Description
$street=$_.StreetAddress
$city=$_.City
$zip=$_.postalcode
$state=$_.state
$Company=$_.Company
$Dept=$_.Department
$Title=$_.title
$mail=$upn
$phone=$_.phone
$manager=$_.manager
$Location=$_.Country
$pass=$_.Password
$expires=$_.passwordneverexpires
$Enabled=$_.Enabled
$setpass = ConvertTo-SecureString -AsPlainText $pass -force
$display="$last, $first"
$upn="[email protected]"
if($_.site -eq 'Arl'){
$HDrive='H:'
$ou='OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt'
$homed='\\share\global\home\medical\na\arl'
}elseif($_.site -eq 'Ash'){
$homed='\\share2\user'
$HDrive='U:'
$dept=Read-Host "Enter Asheboro Department for $upn. Accounting, Engineering, Human Resources, Information Technology, Manufacturing, or Quality Assurance"
$ou="OU=$dept,OU=Users,OU=ARL,OU=NA,OU=company,DC=company,dc=global,dc=pvt"
Write-Verbose $sam,$HomeD,$HDrive,$OU,$phone,$site
This format for braces helps to prevent errors because the braces do not get lost in the strings like your method does.
¯\_(ツ)_/¯