Goldwagen Montana refund refused. Disgusting service!!

I bought a part from Goldwagen Montana in Pretoria. After I bought the part the mechanic that was working on my vehicle came to work on the vehicle and said it wasn't necessary to get the part as he managed to get the same pipe for almost half the price. I took the part back to the store after losing my receipt as they couldn't refund unless I had my receipt which I eventually found and went back as soon as I could. I live quite a way from them and don't go into Montana every day. I was told that they can not refund as it was already 3rd day AFTER THE RETURN PERIOD.!!! I was also told that they had already ordered the part. Bulldust!!! They never had to order my part it was in stock already. The part is still sealed and I know they can refund but don't want to. First of all when I ordered the part the gent that helped me was very unhelpful and not very friendly. No I have to sit with a part that cost me nearly R500. 00 and do what with it??? When I asked for the owners number I was refused. For goodness sake what happened to good customer service??!!! n And this story of We already bought or orderd a new one for our stock is palony. It boils down to No customer service!!! 3 day's late!! Please you can do something about it. I can understand if I opened it and fitted the part and started my car and then wanted to return it. I am currently unemployed as I'm a pensioner. REALLY YOUR SERVICE STINKS!!! I will definitely NOT SUPPORT YOUR BRANCH!!