Rage refused to exchange my jacket

on 29 February i went to buy a jacket at Rage Greenstone mall, 2 days later when i wanted to wear it i noticed that it had a factory fault, one button was missing, i took it back to the store to ask for exchange, but when the examine it they found out the they were actually 2 buttons and not one which i didn't even noticed.The store called its head office and i spoke to a lady called Mandy who refused to exchange , due to the fact that it had dirt, which they claimed that i wore it which i find it very odd, how could i have worn a jacket with 2 buttons missing? jackets in the store are being tried on everyday by different customers and anyone could have touched it with dirt, i tried to reason with them but ended up giving up as they were not ready to assist me. i finally left the shop and left the jacket with them too since i was not gonna use it with missing buttons. I am going to open the case with the Consumer goods and service ombudsman. This is very shocking for an outlet as big as rage, they still don't know how to treat clients. i will never encourage anyone to buy anything from them. Its very disappointing.