Dissatisfaction of repairs

My car was booked in on the 3rd June and I was advised that it would take 5 days to complete the repairs as it was a minor repair instead the car was there for 2 weeks.that was the 1st red flag

On the day of the collection we then spotted few things that were not done correctly on the car and there was a part missing ,which upon raising we were then told we should leave the car and they would fix and we can return the following day.

We then returned the following day and the car was still not done accordingly and we were advised that they will refer to the assessor and order the correct part for the repair and we asked for video footage since they denied being involved in the missing part and they promised that they will come back to us by last week Thursday to advise when we should bring back the car to be fitted with the correct part and also provide us with the footage, till today they didn’t bother contacting us.

We then took it upon ourselves to contact them and we were advised that they are awaiting feedback from the director which should be provided to us by 12:30 at 3pm there was still no further communication from them,we then called and asked to speak to the Director himself which he had advised that it was the first time hearing about our situation and he also made a promise that he would get back to us by COB which also was not the case.