Standard Chartered Bank — Phone calling and harassing to pay

Hi Team,
We have paid their overdue amount 10+years ago in their MGRoad Branch, Bangalore.
However, we are receiving umpteen number of calls from the recovery agents continuously and threatening us.
We have already paid, and now worried about their behavior.

We are extremely under stress, since they are calling and threatening my son, my late father and the other family members.

Please help and assist us.

Thank you.