Adventures with Walmart

I bought 2 new tires cheap at wallyworld in 2008...45,000 mile warranty. This weekend I had the usual rotation with the oil change and found a bump on one of those tires. It has just over 20,000 miles...not even half the life it was promised. I checked online and found other bloggers mentioning how they recieved a pro-rated credit, one guy got $13 as his tire had used up 30,000 miles. So I went to Walmart on Monday expecting 15 or 20 bucks off because of the lower mileage. Things went badly from when I pulled up to the garage. Instead of the tire guy writing up my order, he ran off with my paperwork (I brought the original reciept with me). So, I go inside and there are 4 employees surrounding one other at the computer. She looks up at me and says, "What do you want, I have to go to floral." Well, I was so shocked I don't think I answered her other than to point at my paperwork on the counter and say I need it back. I think the lady realized how abrupt she had been and started to backtrack and become helpful.