[RM7]

Unfortunately, you should have stopped trying to call them and went to written correspondence a while back, with most lemon laws, they get 2 chances to fix and on the 3rd chance, if not successful, they have to buy the car back or provide a new one. It's probably a good idea to invoke this, even if they haven't used up all of their chances, to state that their fix must be successful. If you are not comfortable communicating with written correspondence and putting them on the spot, it's time for a lawyer.