Unitech Ltd — Interest amount not received

My Unitech FD no - 1233797 Folio - 1247705. Amount - 3, 00, 000. Booked on 19.07.2013. Non-cumulative scheme. We received 3 IDBI post dated cheques from Unitech for the interest amount, whereas I opted for ECS at the time of booking the FD. Hence, I returned the cheques(original) in the month of December 2013 with an application and with a cancelled cheque of my account for electronic clearance. Till date I have received no money. Details of the cheque received from Unitech (which was returned) - IDBI - 092701 dated - 01.10.13 IDBI - 092702 dated - 01.01.14 IDBI - 092703 dated - 01.04.14 We tried to contact unitech representative via email. But he does not care to reply!!! Also, not responding over telephone. Contact me at - [protected]@gmail.com