RBL Bank — no response on the credit card cancellation

My dad was issued rbl credit cad last month in a very unprofessional way. An agent approached him through phone and asked if he was interested in any credit card. Understanding my dad's willingness, he asked my dad to send adhaar and pan card copies to his whatsapp number to know more about the card. My father unaware of the fraudulent sent him the requested documents over whatsapp message and after a week, we see that a card package has been delivered to my house (With no forms filled and with no briefings about the card).
My poor dad was utterly shocked and started calling the agent but the agent's number was switched off and isn't working till date. On top of this, after a week's time, he receives a message stated an outstanding amount has to be paid against the credit card. With all these, i have been trying to connect to the credit card customer service team, but every time i get a chance to speck to the representative, they say that they are not privileged to cancel a card and i should follow a different ivr pattern. When i try to follow the instructed process, i end up connecting to the same team. I have dropped an email to the bank with my part of the story as well.

Ps: i can't even go to the bank as there are no branches of rbl in my home town.