I have almost the same problem. I bought my AAPL with 10.6 in one country, moved to another. I wanted to update to 10.8. So I got a gift card at an authorised AAPL vendor store. I had to register a new AAPL ID, because my other ID didn't accept the code. So I registered a new account for my new card. It happily accepted the money.
I went through all the hoops, pressed "Buy App". I only got the modal boxes:
"Please contact iTunes Support to complete this transaction. We could not complete your request. There was an error in the App Store Please try again later. (100)"
It ate my money, I cannot use it, and I am left without an OS soon.
I am done with AAPL, and am putting Linux not only on half, but on all of the disk.
It reminds me of the DVD region codes, and the problem of which one to pick, when sending films to the Space Station...
I went through all the hoops, pressed "Buy App". I only got the modal boxes: "Please contact iTunes Support to complete this transaction. We could not complete your request. There was an error in the App Store Please try again later. (100)" It ate my money, I cannot use it, and I am left without an OS soon.
I am done with AAPL, and am putting Linux not only on half, but on all of the disk.
It reminds me of the DVD region codes, and the problem of which one to pick, when sending films to the Space Station...