Terrible service at Group 1 Nissan Kuils River

Worst service that I have ever experienced in my life. Went in for an oil leak, I got my car back that couldn't lock and a hefty quotation of R32 918 exclusive of VAT, for a timing chain and seal-oil crankshaft. Two days later manager informed me he 'cold started' the car and there was no noise which meant nothing was wrong with timing chain. He apologized and said his (3) technicians, who did the diagnoses, made a mistake because they are just human. He also said that different technicians diagnose differently. He wanted me to pay a deposit for the gasket that must be replaced. I didn't receive a diagnostic report or quotation for his diagnosis and didnt know what he was refering to. He also said that their factory did not hsve the gaskets in stock. It is a week later and I had no communication from him or group 1 nissan. I dont know who of all the technicians diagnosis is the correct one what is really needs to be replaced or repaired. He sent my car back and decided not to use it as I don't know how bad the damage is and even what the damage is. I had to make use of public transport for a whole week. The inconvenienceto my family is nothing to laugh about. I informed Nissan SA and am still waiting on an outcome. Staff involved in this case contradicted themselves when I spoke to them. I totally lost my trust in Nissan and it's employees. I will NEVER refer or recommend anyone to make use of that branch's services. The manager himself told me that there are a lot of irregularities that he had to come and 'fix'. WORST WORST service I have ever received in my life.