Yeah, the title may be slightly stupid, but I didn't know how to say it.
I'm currently studying overseas and I bought a PSN card for my PS Vita and when I tried to activate the code, I got the message that the code is invalid and can't be used. After checking a thousand times and making sure it's definitely correct, I looked up my problem in the internet as well and I found out that I can't use PSN cards from other countries. Sadly I didn't know that, because it seems kinda senseless to me.
So my question is, is there a way to get my money back or somehow still get the money to my PSN account? I'd also change my code for some other user's code. I'm studying in Japan, so I have a Japanese card for 3000 Yen (30$) and I'd need one for the US store. Don't know if that's okay to request that here. If not, just ignore the last part.
EDIT: Oh, of course I'd just sell the card for 30$ (that's actually a good deal for you as the Yen's very strong currently) as well to anyone who's interested in purchasing stuff in the Japanese PSN store. Again, if that's not allowed or illegal to have threads for stuff like this, please ignore this request and if available tell me some other advice for my problem ;]
Try to give it back where you have it from by contacting them and explaining your 'problem'. The big problem on selling PSN Cards is on trust. How can someone make sure that the code isn't already redeemed? As long as there isn't an online service that can check the status of cards and is something like an escrow service to protect both parties (seller and buyer) no one can make sure that a bought card is still unused. And how can someone make sure you are not going to give the card to other people too or simply gonna use it yourself right after selling it? It's simply impossible to make sure that. This was your first post in here, so your trust level here isn't that big and not a lot of people in here are going to believe your story (no matter if it's true or not). So the best way would be give it to a good friend.
Btw: You also can create a JP PSN Account and use the card there if you can handle the risk.