If you taken the loan, you have to repay the amounts pledged by you.
Bank should not coerce or threat on intimidate you.If they do so you can lodge a complaint with police.
You have attended to their calls. Maintain record i.e. date, time,phone number from whcih the call was made, name department,designation, address of the person who called you, and your phone number at which call was made. Bank is suppossed to supply you ther complete details of the recovery agency, if any employed by them.
Talk to the bank and find your ways and menas to repay the settled amount.