Terrible customer service

My vehicle was repaired in February 2023 when I already experienced a problem with the vehicle not being ready when I was told I could collect the vehicle. A week ago my vehicle went on for a service and my service agent pointed out a problem with the repair work that was done Repair-it. I lodged a complaint and received an acknowledgement of receipt. Since then - nothing. I followed up with emails and phone calls. Every time I'm told someone will call me back. To date, nothing. Terrible customer service to say the least. If I can't get a simple response and confirmation as to when I can take my car in for an inspection, I dread to think how the problem will be resolved when they eventually have a look at it.