Here are the facts:
I bought a pair of grey airwalks between two and two and a half months ago (today). I tried to take them back yesterday, but gave the wrong receipt from a year and a bit ago. Today, I went back with the correct receipt. The store manager insisted in a childish and unreasoning manner "you're not getting a refund today". She did reason that this was because they had been worn well. But this is exactly my reason for taking them back. I would expect a pair of trainers to be in good condition after two months, assuming they have been used for what they were intended. The most alarming thing about this is, she is head of the store, so there seems little more I can do!