KSRTC — not got the refund of my unbooked tiket

Address:

Bangalore, Karnataka

Sir on 17/9/2014 i booked my ticket from chennai to bangalore.Due to technical problem my ticket was not booked 7 my account got debited.I dont have refrence number bt i booked it on 17 september 2014 evening.please help me in this matter as soon as possible..amount is 728 so pls make it possible as soon as possible.. bus service is AIRAVAT. Ibooked online complaint to my bank but they asked me to contact you.but no one is answering the call.. pls help me as sson as possible.