Sub-standard quality of service

During March 2017 I took my vehicle to Autoquip to install coil-over suspension. Within a week my vehicle was making an awful sound. I returned and enquired as to whether the shock mountings also needed replacing and was advised that the coil-overs were defective. I was assured that the shock mountings were fine. I was advised to return to the coil-overs to the supplier and purchase Bilstein shocks, which I did. Autoquip then installed the brand new Bilstein shocks. A week later the sound returned and persists until today. For several months attempts were made for Autoquip to resolve the issue however they have not taken responsibility and it has transpired that the studs and bolts on the top of the coil-overs as well as the currently installed shocks were damages and in addition the shock mountings are in need of replacement. I will now have to fork out monies for a third repair due to poor workmanship and bad advice from Autoquip Fourways.