Route 69 Auto Sales BOP inc won't honor agreement, arrogant, too busy prospect Connecticut

I bought a BMW with the written agreement that the I Drive be fixed.They kept the car 3 weeks. And when i picked it up the I drive still didn't work. They told me they needed to  order parts. Two weeks later they said drop it off again. They kept my car 4 weeks without so much as a phone call. I called regularly and no one took my calls. Finally they called and said it was done. Picked it up and the I Drive still didnt work. Had display but no sound. I told the owner and he said it just needed to be reprogrammed. So i went to a dealer near me and they said the unit was either no good or the wrong one and quoted me $1750 to fix it. I told Route 69 what happened and they stopped talking to me all together.