I bought a used pc case on ebay, however the seller sent me the wrong one. It's not too much of an issue for me since I can use it regardless, it's the same model just the non XL one, but I'm pissed off I paid more money than I should've. What can I do? I'm afraid that if I send it back I'll have to pay for the shipping, which for a case is going to be quite a lot. I'd be ok with a partial refund though