Returns

I've spent the last week going to Best Buy trying to return a DVD of mine that I didn't want/would rather have store credit for instead. It's completely sealed (unopened) & even has the best buy sticker price/upc on it. I took it Tuesday hoping to get store credit, but they refused since it was "out of their system" and I didn't have a receipt. I tried another best buy the next day with no luck. Then on Thursday I was able to get my hands on the reciept so I went back Friday. They still wouldn't take it, simply because it's over 30 days... and that annoys me to no end. It's closed, it has the original packaging, I have the friggin reciept and it's not like I want a cash refund.. I just want store credit because I plan on buying something at the store.. I find this to be completely unfair, and all this tough luck has done nothing to help my buyers remorse, and it's just another hurdle for myself to get money together to buy a pstwo.