I bought a prepaid card (25 euro) for the xbox360 for the first time. The cashier has not confirmed / activated it. What can I do now? The media market is far away.
Call or drive to the media market.
Can it be unlocked remotely?
Go there again with a credit card and receipt and have it activated. I don't see how else to activate it.
Otherwise, you can try calling their service number, maybe they can help you if you have both (receipt and card) ready, but I don't know.
Yes you have the code & I hope the receipt, then yes.
I don't have a car because too young to drive and the store is 1 hour away
Yes, fortunately. I'll call there tomorrow.
I can't do anything about that. But, as I said, try first by phone with a card and receipt.