Discovery Insure pathetic unapologetic service!!!

I have been with Discovery for a few years and unfortunately we always give them the benefit of the doubt on every claim but their incompetence is becoming overwhelming now. My car was taken in for minor repairs on 1 Dec 2022. The service provider they chose closed on 15th Dec. In 15 days no work was done on my car. I emailed and had to follow up several times with often absolutely no replies. Discovery did not even know when the repairer would open in Jan. I pay every month for car hire as we need a vehicle if our car goes in for repairs. Discovery gave me a rental on 2 Dec. To date 3 Jan 2023 my car is still not ready. Discovery cannot tell me when it will be ready. They don't bother to even call the repairer. I called them today and they are still waiting for parts from the beginning of Dec. In the meantime Discovery is only allowing me 30 days on the car hire and now insists that I pay for the extended car hire. Is it my fault you chose a repairer that closed for a few weeks. Is it my fault that my car was at uour repairer for 15 days with no work done? They always give us pathetic service and really don't care about their clients. I will not pay this bill. The rental will be returned when my car is ready as we do not have a car and Discovery will have to fit the bill NOT ME!!!!