Modi Hyundai — Registration Card not received

Address:

Mumbai City, Maharashtra

I had purchased Hyundai Grand i10 from Modi Hyundai showroom of Malad west on 28th Jan 2015( took delivery). I was told that I will get Registration card by post on my residential address from RTO within 1 month.Today it is 7th June but I have not received the registration card. I am continuously following up from your sales team of Malad West office but they are niether supporting nor helping in getting the card . At the time of selling the car they committed that they will arrange in getting the card but now they are not cooperating.