Verma Travels — Fare taken for Volvo bus but had to suffer in a non ac bus

I had booked a Volvo bus ticket from indore to durg. On the day of boarding I get a call from Verma travels that the bus has been cancelled and we are arranging another bus, due to the urgency I had to take that bus and they said the current bus will take you to nagpur and from there another bus will take you to durg.They arrange an ac bus from indore to nagpur.
And today when I reach nagpur there is a local non ac bus waiting for me which will take around 07:30 hrs (as said by the driver) to reach durg.