Motolek newcastle bad service i ever experience

I am very dissappointed with Motolek Newcastle service Delivery, i took my car 3 weeks ago, was not starting and they took 4 days to Diagnosed it and their response was petrol pump after 3 days and evential they replaced my pump and i only drove car 3 days and same problem and their technician came and fixed for temporary and it did again and i towed the car back to them and they did fixed it and i wasting the car over weekend i only drove car less than 10 km and its stopped doesnt want to start and check the pump its running again i call the manager David and he say monday morning now i am calling watsup him he just blue tick no response neither taking my calls and i told them the car im using foe work and now i have been loosing a lot of money by renting cars every week, and they have poor customer service no update given to customers and now i am about to loose my job for them any advise. Pls