Kpn Travels — offline ticket booking

Good Evening,
Currently I am travelling from chennai to coimbatore (Ernakulam). Since I am having backpain have asked KPN Perungalaththur office to book in middle so they offered middle upper at U12. Before Ullundhur pettai driver asked me to change it to last row.
They replying very rude and asked me to get down at ullundhur pettai office book and catch upcoming buses at 12pm in the night.
Very upset I was very frequent to use KPN.They didn't even bother single female passenger asked to get down at 12pm.
They way their response is makes not to travel KPN anymore.
KPN needs to take action on confirm booking via offline if they are not able to do so please remove it.people like me won't suffer these type of issues.
I have payed 800rs.KPN needs to take action on these type of issue.
PFA:Added photo for reference
Note:Soon will update vehicle number.