Good luck with that. Don't be surprised if the retailer sends you an apology and a new copy of the disc.
Be prepared for a lot of calls to regional customer service centers and having to wade past a couple of lower tiers of "customer service" on each call in order to get someone to give you your money back or a store credit (more likely). Each lower tier will claim that they cannot refund your money because of the piracy issues.
I only state this because I've actually had to go through this whole fiasco with DVDs which were legitimately defective. Bought one...defective. Returned it, took another from the same bin in exchange. Turned out defective. Returned to store, exchanged for another...same bin...defective. Pissed off, I went to a *different* store, bought the *same* title and had no problems. The first store likely got a bad batch; I had to fight with Store #1, locally and regionally, for a few hours to get them to refund my blasted money. When I first asked for refund, I was willing to a) prove the disc was defective by playing it on any DVD player in their store (if it worked, I told them I was willing to keep it and chalk it up to a defective player on my end) and b) take a store credit because I shopped there frequently. By the end of the ordeal, I wanted cash in my hand. What a hassle.