Accused of being a dishonest customer

bought top on Friday, fitted at home (my mistake, should have done in store, accept) & it's tight. Rush to exchange today & am told it's dirty, has a small mark. I convinced them I didn't wear it, they must smell the armpits as I might have bought it with marks as many clients fit clothes in store. Am told the of T&Cs at the back of the receipt. Have had account with you since 2007 & at no stage have your cashiers thoroughly checked garments for marks nor inform me of the T&Cs at the back of the receipt but only when there's a compliant? That can't be fair. Woolworths sees me as an irresponsible & dishonest client who buys items, wears and brings them back to the floor, worse when am exchanging to show that I love the item, how would I have worn something that doesn't fit? Would I drive all the way, waste petrol & time to bring something I honestly know I have worn, what kind of person am I really? Very disappointed in you. Bought a salad on Thursday, was rotten but I thought of the cost of returning R45 salad vs petrol & time spent and this is what you do to me! AM extremely DISAPPOINTED, never expect this from any store, let alone Woolworths, as if I always return garments