Disgruntled customer

I sent my Dads vehicle to their service center for an assessment in order to do repairs. The vehicle has done repairs there before I suspected that it has the same fault as the last time. I asked them what happens in the case that it’s the same fault? They advised their warranty will cover if it’s within 2 years of the repairs or if the vehicle has not travelled 20 000km/s. We took the vehicle there on the 27th of March 2025. I called their service department on the 28th March. They confirmed that it’s the same fault as last time, however they changed their system they can’t access their records to check the invoice from 2 years back when the car was fixed. They would call me back. The date is now the 6th of April. Not a single day from the 6th of April have they called me back to give me an update, I have been calling them by myself and they have been sending me back and forth. This is the second encounter I have had with this service department. I am very applauded and shocked by the lack of customer service and professionalism as a whole shown by Ellen and her ****orkers. They have no sense of responsibility whatsoever.