Srm Transports — no refund or resolution on bus cancelled

I booked a ticket from kumbakonam to Chennai on oct 28 2019 at 11:30pm. But the bus which come from Chennai broke down on the way.the SRM transports called me and said they can arrange a volvo semi sleeper bus, but I booked a sleeper bus.i told them this situation and they said that they can apply on redbus for refund.i applied the redbus but there is no response email or callback from redbus for 3 days.after that they claimed that bus was on schedule and no problem.i called SRM Transports but they said that only replacement bus was there instead of original bus .that I would get my money back.but the red bus said that the bus was on schedule