Paulo Travels — change of bus

I have booked my ticket in volvo bus for rs. 1470 from goa to aurangabad, this bus got canceled and alternative arrangement was done in multi axle bus, which is a low category bus which was costing only rs. 1100 at the time of booking. This bus was very old, dirty and stinking. Bus delayed by 3 hours and i could not reach my office. Pl refund me the difference amount.