Tamil Nadu State Transport Corporation [TNSTC] — Transaction failure

I have booked a ticket from Thanjavur to Bangalore for 4 th November. The amount has been sent to TNSTC via UPI. But I didn't get any ticket. I have waited 1 day for the refund and I am complaining about this issue. There is no proper information or response about the issue from their end. I didn't know where and what to do with this issue. Consider my complaint and do the needful.
Thank you,
Vijayeshwaran T