Penta Menlyn service dissatisfaction

I sent my vehicle in for a diagnostic check, chose to do half the work due to the excessive cost of R53K. It has taken nearly 12 weeks now and I still do not have my vehicle each time they import a part it takes 4 weeks then they find fault with the battery that is now flat ( 12 weeks I can understand) now they cannot programme the keys that were working for the last 3 years. The dealer principle does not even have the decency of returning calls but rather leaves it up to the service personnel.