Most pathetic Technicians and techical manager ever

Installed my tracking device on the morning of 16/09/2019 after the technician left my electric windows stopped working, phoned them an they send out a senior technician to resolve the problem the same night but he couldn’t find the fault and made an appointment for today. After he left I noticed that my passenger seat was badly scratched. This morning I phoned Cartrack and inform them of the seat. The technician came and resolved my electric window problem and then informs me that when he left that the seat wasn’t like that and that it happened after he left, but the vehicle was locked until i got in it and noticed the seat. So the technician is basically calling me a **** but in a way i can understand that it is normal for him to not care about other people’s stuff if u look at his company car. It is very dirty and unorganized all the stuff just thrown in there. I think for a senior technician it is a disgrace to the company name. Sounds and looks like they don’t want to take responsibility for my seat in the vehicle that was damaged by them. Also told them to cancel my contract and remove their device wich i am still trying to get done as I am still within my 5day cancellation period