Tamil Nadu State Transport Corporation [TNSTC] — Issue on ticket cancellation

Dear Sir/Madam, I am V. Dhanush Kumar. I booked tickets on 18/05/2023 for 21/05/2023 travel (From Arakkonam to Tirupati). But bus is delayed for 3hrs and decided to cancel my ticket. But when i logged in SETC portal, My ticket is not available in Booking history and there is no option showing about cancellation. I tried several times. But i am not able to cancel below ticket. I request you to cancel tickets and help me to get refund. The tickets fare is Rs175. I expect you to take this matter as serious and do the same.

Here the Bus Ticket details: Arakkonam to Tirupati).
Bus route no: 966T
Date of journey: 21/05/2023
Seat Nos: 27.
Passengers Details: V. Dhanush Kumar
PNR No.T44041621
Bus No: TN-01 AN 2281
Thanks & Regards,