Kotak Mahindra Bank — regarding harassment from collection agency

This is to bring in your kind attention that i had a loan from citi financial (Loan no.:[protected] for
Which i have undergone settlement in 2012 with amount of 12500.
I have paid that amount and received settlement letter and receipt for the same.
For last one week i am receiving threatening calls from different numbers
Calling my colleagues and family members and using abusive language. My mother is a heart patient and
Cannot go through this kind of mental pressure.
Requesting you to kindly go through the matter as i am going through mental harassment as well as i am
Not able to work in my office.
Looking forward for a support.