Videocon Industries — change of rtn without access to the present rtn

Address:

560098

I request you to change the RTN of the following account, and also we dont have access to the old number nor do we know which number it is registered on since the connection is in the name of the owner of the apartment.
Tried reaching the customer care but never got a positive response.
customer id: 78428849
Smart card : [protected]
New number: [protected]
Account holder name: C V Reddy
Hoping a positive response.