Extremely bad service

My vehicle was damaged by a technician from cartrack when he came to install a tracker on the 17/05/2023. I reported the matter to him and to his office on the same day. and they failed to assist me. I have been calling and sending emails but I still don't get assistance. The last person I spoke to yesterday was Lesley who promised to refer this matter to get manager who is supposed to authorise the cancellation and promised to give me feedback. I haven't heard from them. I refuse to pay the cancellation fee because it's not my fault that they failed to assist me. They are so unprofessional and I don't trust that should my vehicle be ****** it will be recovered by them after the terrible service I have experienced with all the staff I have been communicating with since day 1.