RBL Bank — Credit card issues

Address:

New Delhi, Delhi, 110017

Hi,
I had a credit card from rbl till 2014. I requested rbl to discontinue this card after paying all the dues in mar 2014 (Rs. 86, 000 with some extra money). Subsequently, i destroyed this card at that time.
Despite my request for discontinuing this card, these guys have not done the same and are continuously charging a fee. I have had many calls with them informing the the card is not in use, but to no avail.
Now, these guys are giving abusive calls and harassing me and my family members.
Please look into this matter and advice what needs to be done.
Thanks and regards,
Anubha