Dunlop Strydom Park is a No Good

I’ve used Dunlop Strydom Park since I was 19 years old. The place has gone for a ball of hair that your cat coughs up. I replaced 2 front tyres and a full suspension all round on my Volvo XC60, 2500km later tyre shredded to pieces on outer tread. Down to steel wire in the tread, car is undrivable, Knocking and banging that never existed on the front. Take it back they say some one else worked on the car and bolts are missing from my sub-frame. The next question he has is are you buying new tyres??? Do not go to Strydom Park Dunlop.