Oh, you did the right thing... absolutely.

I got some DVD movies for Christmas and they were duplicates of movies I already owned. They came with gift receipts so I made a mental note to take them back to Best Buy. January 13th, I tried to exchange them for different movies... but NO! Best Buy has a 30 day expiration time for exchanges. They were in the original shrink wrap! I had receipts! They wouldn't budge. SO...

I always test drive sub-woofers, TVs, car speakers, whatever, from that Best Buy, then I call the manager over to thank him, then I inform him that I am leaving to purchase them from Circuit City or from the Web. If he asks why, I remind him that if he'd have taken back "Stripes" for an even exchange for another movie valued at $12.99, he'd have made that $500 sale today... then I politely shake his hand, smile, and walk out.