BAD SERVICE AND DAMAGE TO MY CAR

Last year 2014, my car went for repairs at Technostar after it was damage by bad terrain road in rural area. When it came back the back fender was not put in correctly. towards the end of 2014 I was hit by hailstorm which damaged my roof, bonnet and windscreen, the car went back to Technostar. at this moment the top of the car paint is coming of. when I complaint about this I was told they are checking with management.until now I have not had no response. I also went for the fixing of the door in February 2015. the back and front bumber is not put on correctly, the roof paint is coming of, and the two rubber at the bottom of the car has come of.it has been four months I am waiting for them to fix my car correctly. I have never experience such poor service.