Unfair treatment from Mayfair gearboxes germiston

I took a truck for I took my truck I took my truck to Mayfair gearbox in germiston 4 Gear selection problems and the truck was fixed then the problem with the payments because the both the client didn't pay in time so the truck stayed there for sometime after finishing paying instructed my service advisor to start the truck for me so that you when you come and pick it up it will be ready but to my surprise the service advisor told me that the truck is not starting then I asked him is it the problem of the batteries so that I can buy new batteries then she said no will swap the batteries but the truck is not starting I said I will come because when I drove the truck there it was starting and when you guys finished you said you tested everything the truck is running properly then I asked you a question that now you if you are saying that I must told the truck from your premises how is it gonna work because this truck was running if we find out that something is missing there on the truck on what who is going to be responsible then from there I never got any answer from the service repair advisor I didn't try to call the Boss 4 Mayfair no reply send my message no respond I tried to phone again no response I tried to phone them other manager there no response so I don't know how am I gonna get the truck was now I was supposed to get the truck after a holiday that was on there 20 seconds if I'm not mistaken up to now or no respond from if I don't know what kind of service is it because I've paid the truck in full and I'm not getting my truck back and my truck is not starting and I'm trying to call them no one is responding to me I don't knows that professional service or what and this is not my first time to be on this platform with the same company again I hope after this complain maybe they will respond I don't know cuz my truck now was just standing for the whole week or more because I cannot take a drug which is not starting yet when it came there it was starting who supposed to be responsible for sight if there's anything which is missing or what may be the cause of it not starting last time I brought again another truck there the catwalks which covers on top of the gear box went missing and was promised that they will replace them or send with the driver that is been in years now they never bring those covers so I think there's something wrong with me feel over there under mind customers depending who you are