Bank or financial institute recovery

Defaulted in personal Loan. Recovery agent harrising by way of repeated calls to friends, relatives, in laws it who every they found connection on social media. I am aware about the ethical process if it is non payment and many clauces were part of terms I signed but non of such terms that they can go to this level So I want to know what it can not be treated as breach of agreement I signed at the time of taking Loan 2. In case we file legal suit than who should ..? Beneficiary of Loan or the person whom they calling just they find social connection 3. Police does not help as they are single minded saying banks are right and you are wrong. So what other strongest legal remidy . 4 can defaulter appoint any advocate as attorney and ask banks to communicate with him about this matter in future. 5 recovery agent never disclose there office addresd, name, authorization etc and when ask they give just bank address so can defaulter have liberty to ask bank whom they have appointed fir recovery and scope of that. Ramesh