No refund and keeping the parts as well

On line parts in randburg gave me the wrong parts which I paid for not knowing it was the wrong parts. They assurred me it was the right parts. When I returned the parts unused they refused to refund me and told me that they will sell it for me and let me know when to collect the money. It is more than two months now and I have not recieved any call or communication from them. When I phone they say some one will phone me back in five minutes and nothing happens. This is not good business conduct. They sell parts and re sell it again it seems. The clients loose both ways. Even the owner himself keep ignoring me. Please do not do business with online car parts in randburg. They are *******. Mr Nkosi Kumalo was the salesperson. I specifically told him which parts I needed and he said it is the right ones. Stay away from this business.