False date of delivery- poor quality checks

I have been given false date of delivery. After 15 days of keeping car with them- 1. After getting parts, they waited for 3-4 days without knowing that car is with them and calling me to get car to fit the parts. 2. After 15 days, all was done but kept car because they were waiting for sensor, when I said I can take car without sensor. They came up with other issues which need to be fixed and still take 2-3 days. 3. Again after 3 days and personally visiting the centre- they gave me date to collect and no one called me or was reachable to talk to me 4. Again after 2 days on date promised to deliver the car, they found out that they have assembled the wrong part which they only came to know on the day of delivery. Which will again take more that 7 days to come and more days to assemble.

I am still waiting for the car now, they are not easily reachable , I have to literally call them 5 times a days to get status. This was never expected. I am not happy and still without car.