Bharat Sanchar Nigam [BSNL] — Cannot get UPC

I am trying to port my bank number and trying to generate UPC code for that. Every time I send message for porting I get response- Upc cannot be generated for the reasons: (1) there are subsisting contractual obligations with your service provider. Please contact your service provider for further assistance.

I tried calling bsnl customer care many number of times, but of no use. They only kept on waiting for 24-48 hours and then close the complaint docket without resolving it.

Kindly resolve my issue.