Pathetic service

I purchased a used car from the dealership at the beginning of February 2021. The service that I have received from the staff including the Sales Manager and Dealer Principal is absolutely pathetic. I have had to constantly follow up with them for outstanding items ( Natis papers in my name, issue with passenger side front door and issue with the back seat clip) and today have only had one issue sorted ( back seat clip). Even after a meeting with the dealer principal about the communication issues, I still don't get any feedback as promised.