I've been doing business with Gamestop for many years, and have never had a problem. Of course, I save all of my reciepts. Even once when I had a problem with a few games that my brother bought, and he didn't have the reciept, we calmly explained the problem and they were glad to help us, even with no reciept, as they had our names in the system and proper ID provided by us.
I work as a customer service agent (in a different company of course) and in my experience, I am more likely to go out of my way for a nice customer with a legitimate problem, rather than for a customer with a bad attitude, who keeps saying "This is terrible! I've been a long time customer! You NEED to do this for me! I'll report you and take my business elsewhere!"
Personally, I'd be glad if you take your business elsewhere. A company doesn't need your bad attitude.