Ridiculous service to exchange item!!!

If I could give lower than 1 star I would!! I purchased a pair of slippers for my 2 year old online and collected it on Friday. It was already hard for me to pay R250 for a pair of kids slippers but did it anyway as I know Woolworths has decent quality. I tried it on for my little girl, it didn’t fit so I immediately took it off and decided to return today, (Sunday, 13 July). When I took another pair off the shelf the first pair’s seams was coming loose at the bottom so I took another pair. This pair had dirt on the sides, indicating it is filthy or poorly transported. When I tried to exchange, the lady told me my pair looks dirty and worn. When I said my child literally took 3 steps in it inside the house to see if it fits before taking it off, she said she cannot exchange as It’s worn. How on EARTH could my child that cant even wear it due to size too small, wear it to “well worn” state in 2 days?? When I showed her that the same dirt is on a pair on the shelves she said to me It’s not the same, sorry. I am so incredibly ANGRY, that I decided to purchase from Woolworths!! As anyone knows, It’s not an easy task to buy for a little child. Ridiculous service beyond! I cannot even believe it!!