Pathetic service

I bought 2 pairs of shoes for my daughter on the 17th of November at Ackermans Lyttelton,when I got home,wrong sizes I went to Ackermans Mabopane on Sunday to exchange,they didn't have the other pair so I asked for a refund for the other pair and an exchange for the other. They refused to refund the shoes saying they are dirty, that means the shoes were worn,with a price tag I suppose,on top of that they say I can refund where I bought the shoes without a slip , because they have to retain a slip. No guys this thing of black market must come to a stop. When I go to Ackermans Centurion,I expect to receive the same service for both stores. By the way the staff who assisted me were very rude,Letta Shiburi and Thabo Mokwena.