Redbus — Asking for extra amount for ticket after confirmed booking.

Address:

Mumbai City, Maharashtra

I have booked a ticket from redbus.in for mumbai to shirpur journey of 1 November 2013 on 9 October 2013. it was available with Rs. 500 fare at the time of booking. and after sometime price has been changed for same. and bus provider called me and said that i need to pay extra amount for same because of festival time. it is not my fault it was completely yours and bus operators bus fare data update problem. why would suffer in this case? same time on many other sites tickets were available at same cost. although I missed them too.