Pathetic service---disgusting

I took my car to Renault The Glen on on the the 07-08-20 and explained that i would like for them to check the two errors i was getting on my dashboard and to change my brake pads and wipers. The first error stated "check fuel injection system" and the second error stated "check anit-pollution system". I got my car back from them that they stating that they had changed my brakes and wipers and that the reason for the errors was because of the fuel quality that was put into the car which I filled at the same Egen I've been going to for the past 3 years. I was advised to drive out the R500 worth of fuel in my car and fill fuel at a different petrol station, i filled another R500 worth of fuel at another Engen garage but the problem persisted so I took my car back to them on 08-08-20 and was told to bring my card back on the Tuesday after they reset the computer system. On Tuesday they checked my car and confirmed that there were no issues and asked that I come to collect it, after fetching it the problem still arose and in fact it endangered my life because my car was not going at a higher speed than 30kmph on the highways and kept jerking and stalling. I had to turn around and take it back where they then picked up that i need a new fuel pressure pump after three attempts of diagnosing the problem. I asked for a courtesy car which i needed for work and to transport my mother for dialysis 3 times a week but i was told i had to wait 7 days for one. The manager Johan promised me that he ordered the part but it somehow got taken by another Renault branch which they still haven't been able to explain to me. He promised me a call back to keep me updated but he still hasn't contacted me after my last interaction with him. I am utterly frustrated and disgusted by their don't car attitudes. Renault South Africa has asked if they gave me a courtesy car during the first 5 days which they did not and they failed to tell me that a more competent Renault dealership would have been able to. It has been two weeks I am still left with no car and I have to make 10 calls a day begging and shouting for assistance. All I want is for someone to take responsibility for the *********** service, get me a courtesy car, consider compensating me for wasting fuel for incorrect advise given me to and fix my damn car so that i never have to see anyone of you again.