Nestaway Technologies Private Limited - Security deposit refund not received

I have rented a flat from nestaway in the month of March . Due to lockdown the move-in formalities was not completed so they postponed the move-in to a later date . Though they asked me to pay a month's rent and told me that later it will be refunded back. After some months they kept on piling the rent and when asked they told that they are cancelling the property and I will be getting refund . Now they are incurring some unnecessary charges and not even returning my security deposit.