Deliberate delays and decision making /Poor Customer service

I submitted a claim in 2023 October for mechanical repairs of my car. Since then to date my car is still with the service providers awaiting parts, my concern is that I’m paying installment of the car, premium every month and over that, I’m renting a bigger car to be able to accommodate my Son who is living with disability and on a wheelchair. I have been the one calling my insurer to get progress of the car repair or parts being available. I’m not happy with my insurers communication and feedback, everyone I engage with, seem to be defensive and verbalise that the issue of parts is beyond their power. I’m really struggling and feel there is no TCF here.