How do I create two iTunes accounts under the same email address?

Question

I've got my account duplicated -and charged for apps I already own- by using my email address as login instead of apple ID, but I've been told it's my fault so…
I'm trying to figure out
*How do I do to create two iTunes accounts under the same email and having different IDs?*
I mean, two accounts with different purchase history. It doesn't matter if billing address, or credit card are the same (or different) because none of them flag apps as "purchased"
I tried today from iTunes, but it tells me the email is taken.
Do you know any way a user can do it from our end? (website, iTunes, iPhone)
If you've got charged by apps twice, please don't say it here. I don't want my post being deleted again. Thanks.

Answer 1

Beavis2084:
Expired .mac accounts HAVE NO EMAIL. You own the id (which iTunes requests to be spelled in form of an email)
Also, FREE .mac accounts have no email either.
What you see in the screenshots is what I'm saying:
There's been a change in the way iTunes wants you to login. The iTunes reps see at their end what you see at the top of the window, which probably is the "migration" of the new login: Old login system, using ID (in form of email for iTunes)
BELOW you clearly see where says "ID" and both have the email as login.
(again, that .mac email doesn't exist and NEVER DID)
That's the NEW login: your EMAIL.
I'm sorry I didn't explain it better the first time. I wrote about this so many times to iTunes support reps to prevent them to "read" what their system says that I gave it for settled. (not to mention that my first post was removed because "it lacks of interest for others"
I own an apple ID, given away with the purchase of a new computer (nothing small by the way) and when that happens (and never subscribe for a paid membership), you use ANOTHER email to be related to your account.
Now that AGAIN apple asks you for using your EMAIL (non-apple in our case) instead of your ID (which you can't use or you will never get a notification again!) the system believes there are two accounts.
It's like your credit card bank changing the address for sending the payments. You are STILL paying, but getting a higher rate because their CHANGED the address and the check never arrives.
In this case, signing in with a different string, makes the system believe there are two accounts. And that probably is under the policy which probably states purchases are not charged twice for SAME ID, and SAME iPhone… and you used a different ID, so it must be fair (sarcasm). Who told you to do so? Bad boy!