Telangana State Road Transport Corporation [TSRTC] — Seat manage issue

I have booked seat no 6 from hyd to kothagudem in deluxe service but they allot long travel vechile where seat no 6 is alloted to second driver, this have no option to sit comfortablly.when i ask to driver he said its your mistake to book in online, 1 week back i have travelled this same route in this service the seats were normal, now i have no option to seat in my reserved seat please correct this mistake