Karrm Infrastructure — refund cheque bounced.in sufficient funds

I cancelled my flat in november 2018 and they promised they will give the refund in 6 months. The refund amount is more than a lakh and they gave a cheque for rs 3, 0000/. It bounced. It was dishonored, the reason being, insufficient funds. We need to take action on these immediately. Lot of people are suffering. I visited them personally and they have given assurance, it will be honored. But it bounced.