Varun Hospital — Defective seat

I hve booked my tickets from bhopal to mumbai 30th May 7:30, seat no 11L had no no issue with the bus from bhopal to Indore but my bus was changed from Indore to mumbai, my seat has no ac duct it was evn hard to breathe i hve sat all the journey in the walkway if ther was a defective seat you PPL shouldn't hve distributed the seat