Maruti Suzuki India — name registration transfer pending for more than 1 year

Address:	700058
Website:	www.premiermaruti.com

I purchased a car last year decemnber from maruti true value
Dealership name - premier carworld pvt ltd ~ 92f, bt road, kolkata-700058 kolkata west bengal

And it's been a year since then and till now they haven't transferred the registration details to my name. I have followed up with them for more than 100 times, i literally call them on a daily basis, but they don't respond to my calls properly. I paid 15k for the name transfer during the purchase of the car and still now i haven't received anything from them. I am being harassed by them and every time they respond to my calls they just make up some stupid excuses. Their attitude and behavior is utterly unprofessional and i need some help dealing with them.

Let me know if you need to upload any further details like purchase bill, delivery note or my car number.

At this point i really don't know what to do. I even tried to email maruti true value and raise a complaint but they haven't taken any action.
So please advice.