Sun Direct — Security breech

Address:	530022
Website:	www.sundirect.in

We have a sun direct connection at home in visakhapatnam. Since 2days some unknown person is harrasing my father saying that he recharged our smart card by mistake and asking to pay him the amount in cash. When my father asked him to sort out the issue with sun direct he is telling that he was at their office only and took the contact details form them only using smart card number. When my father asked him to hand over the phone to the office staff they are telling my father to pay the cash and why should we pay the cash for any for which we are not responsible and how come sundirect leak our personal information to any third party? why should my parents face all this nonsense?
As this is a security threat to them can we lodge any legal case against sundirect using all the proofs?