Rude threats by Supa Quick Heidelberg

I took my rim for repairs at Supa Quick Heidelberg branch Gauteng a month ago they said they fixed it a day later the same crack came back and I took it back to them to which they said they would fix it and call me. They borrowed we one of their second hand rims so I could be mobile whilst they fixed my rim. They never called me a month passed by, yesterday one of their employees met me and town and told me they want their rim back. Today I went to their store to return their rim with the assumption that mine was fixed. When I got there my rim was not fixed but they were rudely demanding their rim back saying I was taking advantage of their kindness (to my shock) I told them I had been waiting for their call but none the less I was there to return their rim and get mine back which they were fixing. They told me they could not fix my rim and they do not care how I leave their shop. I told them I will not be moving my car from their bays until they figure out how they will fix my rim or return my money. They told me they will not be refunding me and I must now ****off before he knocks me out because I do not know who I was messing with. I told him to try that is where all the other Indians in that shop started threatening me. One even said he would shoot holes through my car I should not **** with them and they will drag my car out their property. I have left my car in their working bay and I will not remove it until they apologize for being rude and fix the rim I had paid for.