Karnataka State Road Transport Corporation [KSRTC] — refund for online failed transaction

I tried to book ticket from ksrctc website. The money 391 got debited from account but the website showed transaction error. I want a refund of this money and my ticket also didn't get booked. My ob reference number of failed transaction is ob40796344. I want a refund for this amount as soon as possible. The website holds no record of failed transaction this is disappointing.