Auto Master Maitland are not Mechanics

After a routine service that should have taken a morning, I had to return my vehicle three times! My car was losing power on the highway so I asked them to change a sensor, which they did. When i fetched the car the first time, the mechanics forgot to tighten the rear wheel and it damaged my bearings. I brought it back instantly and they spent another day on the vehicle. Once i fetched it I drove a few km's and my car started to shake and a grinding noise was heard on the wheel they had supposedly fixed. I was so worried i took it to another mechanic to fix the wheel- who was shocked at the service I had received. Four days later, my car would not start, Auto Master had supposedly changed a sensor in my engine- when i asked about it they could not tell me which one? I phoned them to arrange for them to fix the initial problem only to have the workshop manager tell me it was not what they fixed and its a new problem! I would not recommend them at all. My car is in worse shape than before!