bad service

I got myself stuck on the highway because of poor service received from Great South Autobody. my car went for panel-beating through miway arrangement. 3 weeks later, I was notified that my car is ready for collection hence i went there only to find that it wasn't ready. i spotted something wrong and was advised to come the next day. i went there on day 2 but still not ready, with front bumper not well installed hence i insisted they fix it on the spot which they did. i took the car. 7 weeks later, the car had a frequent knocking sound underneath, only to check....the front right tyre was grinding the inner part of the bumper. most of the plug pins were not replaced. I AM NOT HAPPY