DCP damaged my vehicle !

I took in my vehicle to DCP in September as authorised by my insurer, Renasa and had several problems with the workmanship after several complaints I was assured by both the group ceo Craig as well as the senior manager there, Wayne that my vehicle would be done professionally and they would personally inspect it before it is released to me. I then received a call in October stating that one of their employees rammed a clients vehicle into the rear of my vehicle causing extensive damage to the rear of my vehicle. I expressed my disapproval as well as my concerns regarding this to the group ceo, Craig, who requested that I give them a chance to repair the vehicle and then if I am still not happy he would come to some solution where I am happy.The vehicle was repaired and collected in November and since then I have had several problems with the vehicle as well as the work done on the vehicle was very shoddy, the paint work has huge spots and holes can be seen there is sand paper marks where they repairs the body panels are not aligned properly and the paintwork in some places has excess paint on them,the vehicle has also depreciated in value due to the accident and shoddy