TTK Prestige — induction cook top ttk prestige

My induction cook top gone out of order 2 months back. I registered complaint and authorised service centre of trk repaired the same and charged me. Again within 20 days it is out of order and i lodged complant and service centre took it for repair but not returned till date it is almost 30 days. Complaint no515366. Several email & call has gone into vain. Very poor post sale services