Redbus — Ticket is not confirmed

Address:

Pune, Maharashtra

My Brother booked a ticket from Pune to Ahmedabad in Eagle travels through Redbus.in. The date is 23rd Dec 2014. The ticket is confirmed and amount was deducted by Redbus. When boarding, Eagle travels denied that ticket is booked and hence was not confirmed. On what basis Redbus.in book and confirm ticket with Travel agents? On what basis they debit the money of customer ? Why they deny the refund of customer?