Andhra Pradesh State Road Transport Corporation [Apsrtc] — Refund not done

Hi on 23 aug i was using it for the first time so thought to put some amount and book ticket so I tried to put 850 with the service fee it got debited from the account and showing me pending on the e wallet so tried calling customer care they told it will be refund but it is been more then 8 days now i have tried reaching out on email but they said it is failed transaction checked with my bank told it as gone through but they have chargeback the amount and no one is giving me proper answer when told to give to the manager they said we can't and cut the call pls help me to get the refund