Unable to repair vehicle and still have an attitude

My car was jerking and switching off, so I took it to McCarthy Toyota on New Road. I was advised that my carburetor needs replacing of which I replaced it, a month later my car did the exact same thing and it jerked and switched off, only for me to take it back to them. They checked and could not find anything of which I was advised that should it break down I must give them a call and they will come to me and check the car. The car did the same thing and broke down and they sent someone out to me whom advised that the solenoid needs to be taken out at the starter, I then took it to them and was told that the car is fixed only for me to break down the following week and then I called them out and was given a stupid reason that I was stuck without fuel, which was a bull**** story as I know how many kilometers a tank of petrol gives me, so I took it back to then to be told that the gauge is packing up and I had gotten stuck without petrol , which still didn't explain it and today I got stuck again only for the person that came out to tell me that he cant see what the problem is and he is tired of me breaking down, him feeling frustrated. He indicated that he will do a test to see if the fuel volumes are pumping correctly and if it is he doesn't know what the problem could be. If he thought it is frustrating just to come out to me which is in Midrand, imagine how I feel, I am a woman whose vehicle switches off because they can not identify the problem. I was charged to replace parts in the carburetor which wasn't even a problem. Thank you Toyota for useless service and the inability to fix cars. If you think you are frustrated imagine what I feel.