Charged for a song I didn't choose to download

Question

Last night I chose to buy and download three albums from the itunes store by a band called Machine Head. I already had another of their albums which is in my library uploaded from a CD I bought in the mid 90's.
I also chose to buy and download a few individual songs from other artists in no way related to Machine Head and which were not, at any time, on an itunes page at the same time as any Machine Head songs.
I purchased the three Machine Head albums separately from their separate album pages on the store and had three pop up windows, one for each album, asking me to continue.
When I looked at my invoice email this morning an additional individual Machine Head song was shown as being pruchased for 99p. This track is already in my library as it was on the CD I uploaded threeish years ago and is not on any of the three Machine Head albums I downloaded last night, nor was it on any of the album pages for it to be accidentally included.
As I didn't purchase any Machine Head albums from anywhere other than each specific album page on which this additonal song is not available, how on earth has it been downloaded (without appearing on a pop up window) and how do I get the 99p refunded?

Answer 1

It's interesting, it shouldn't have made an error like that, but getting any sort of "refund" from iTunes is really tedious and it's not always possible, especially if the amount of money lost is so small. I mean, it's one song, so I don't see what the big deal is. Sure, it may have been charged to your account unintentionally, but it's one song.
You sure that it was not on any of the albums you purchased or in anything else, but it was on the list of things you had purchased? It's easy to misread something, so go over it again.