I purchased Psych The Complete Sixth Season last e...

I purchased Psych The Complete Sixth Season last evening. Disk 1 did not play reliably, but disk 2 did, indicating that disk 1 was defective.
Their return / exchange policy on their website and the receipt states "Defective computer software, video games, audio CDs, DVD videos, and pre-recorded videos will be exchanged for the exact same item only."
I attempted to exchange the set the next morning, and was told (after the clerk confirmed they did not have another copy in stock) "we cannot exchange it", An assistant manager then, after speaking with the manager, asked me to follow him throughout the store where he told me he'd inserted it into another player and "I will have to charge a 15% restocking fee". I replied that I would take my business elsewhere, to which he only replied "We don't want you to do that." and repeated that he could not approve a return without charging a 15% restocking fee.
There was no offer to order a replacement.
They wasted a significant amount of my time failing to fulfill their own policy and their contractual obligation.
I had intended after the exchange to purchase several other items at the store: Doctor Who Series Seven (parts 1 and 2), White Collar Seasons One, Two and Three. But their refusal to honor their own policy has prompted me to check the prices on the same products at Best Buy - which I found to be lower for all five, plus the original Psych product.