Supertech — supertech azalia roi

Address: sector 68, Gurgaon, Haryana, 122001

I have booked one flat in supertech azalia (Sector -68 gurgaon) under subvension scheme in 2017.
The company as per agreement was supposed to pay the roi on monthly basis till the possession of the flat.
For few months the same was paid and now the same is not being paid and no body from customer care is responding as when they will pay.

In addition there is no update on the construction.

Do not know whom to approach.