Improve customer service at Suzuki fury Fourways

Suzuki Fury Fourways is the most unprofessional dealership every time I go to that dealership I always leave upset or angry, they do not give good customer service I took my car there requesting if I could get a new side mirror and cover because I was involved in a accident and the man in parts name Louiso quoted me and informed me that I will get my mirror cover on the 26th of March I arrived at the dealership and he told me the mirror cover had not arrived I then asked him why he could not have sent me a email letting me know because I wasted petrol and time driving there for no reason and he could not answer me then Friday last week I went there again and the mirror cover was there as he tried to fit it, it did not fit I then asked for a refund and with attitude he told me that I can’t get a refund only after speaking to a manger they then told me I would get a refund, but now it’s Tuesday these people told me I would get my refund after 48 hours it’s Tuesday and no money back I sent a email asking why I have not received a refund and they did not respond and now I had to call and the manager rudely told me to find out from my bank, how can I find out from my bank about a credit when there is no money from Suzuki I want my money back these people are rude unprofessional every time I go to this dealership I always leave upset I just want my money back so that I can get better service from somewhere else. Who ever is reading this do note that this a continuous problem where people there either give false information and don’t give proper customer service!!! Please assist me so I can get my refund.