Redbus — Seat change

We have booked mumbai to sendhwa 3 bus tickets and after boarding the bus our seat numbers were changed and last seat was given to one o[censored]s which was horrible, they say these seats were allocated in chart,
What is the sense of even booking online in advance if we dont get seats we choose,
All the while we kept complaining driver but no support.
Should we raise the issue to consumer forum that even after booking from redbus online website 2 people are assigned the same seats.

In night time we are facing troubles just because red bus online bus ticket booking