Non-responsive and very disorganised

I booked my car with Farber in December and I was told to bring in, when I came on the date given, the parts were not ready. I was given another date, the parts were not fitted properly and one part was not available. I was told to come back on 29 December and I did, when I got there the part was not available once again. I have called and emailed, I have not received any response.