Shody workmanship

I had a claim in November car was booked in with Ross Champion in Prospecton. I was notified the car was ready, I went to fetch the car only to find that the cars central locking didn't work along with a slew of other issues the car was then returned saying that the central locking was reprogrammed. I collected the car, the boot was not opening then was told it's a sealed unit I then took the car to the dealership, only to find out that the motors and everything was fine. Was then informed to go back to the repairer. When I returned my wires where deliberately cut. This week my Bluetooth module stopped working I assumed this was a faulty unit only for the unit to be functional when tested and informed that it was pointless to order a new unit. I can only deduce this damage was done by the repairer as the last time the they damaged my car due to my complaint