Supertech — Regarding behaviour and commitment denial of staff

I have booked a flat I1/1901 in Ecovillage II Greater Noida in November 2020. I had been struggling with the rental since 2 months as it was committed to give rental house on Jan'2021 week 1. We are struggling with this every week. They have committed alot of things. Earlier they told to provide flat within 15 days of booking. And it's been 2 months every day they call that don't come this week or today as the unit is not prepared. Today the flat issue got resolved which also took us 4 hours of waiting as there was no keys. Apart from this, on the date of booking they have committed for payment scheme of 36 PDC cheques. But today, they not only disagree on the commitments also, misbehaved with us. Their tone of speaking was so loud and rude and scold us that you do whatever you can do. We have politely asked for the refund and cancellation of booking and asked to just give a written application. But they rudely speak to us. The name of the person who was rude and misbehaved is Gaurav. Please answer to this complaint as soon as possible.