Reliance Jio Infocomm — Non receipt of security deposit refund

I had terminated my JIO Fiber connection, the JIO team collected the sattop box and I recived a msg asking me to complete the bank details. I had provided the same and that was comfirm as I received an OTP. This process was done in the month of June 2021. Now it over one and half month I am contantly sending mail to process my refund but they simply asked me that bank datails are not matching and submit the details again. I have submitted the bank details along scanned copies of blank cheque and Pass Book five times but the matter is not yet resolved.
The JIO Fiber refund process service ID is :[protected]
Customer ID is : [protected]