Kerala Srtc — System of Ticket change

I traveled in a Ksrtc today frm cherthala and got a SFP palakkad bus.i intended to take a ticket to chalakudy but i unknowingly said thrissur.the conductor had already printed the ticket and was not ready to change it as it may lead to loss of money frm his pocket.This complaint is actually not against the conductor, but against the system where the ticket printed cannot be cancelled and reprinted as such technical issues can lead to loss of money frm the traveller. This issue should be looked into and solved to avoid grief caused to the layman.