Record these calls. Give a terse reply to recovery agents that neither you are borrower, nor surety, nor a guarantor, nor a reference and stop the call at once.
You may also submit a written representation under proper acknowledgment, addressed to BM of these banks with a cc to Police Commissioner and SHO ( of your area) and mention list of all phone numbers with date and time and demand complete details e.g. name of recovery agency and agent, address with pin code, RBI registration number, Name of prop/MD etc of the recovery agency, email id, fax number, phone number with STD code and also the details of Local Head- collections and Recovery of the bank. You may mention that you shall be lodging a police complaint and approach your lawyer, NGO's, public and legal forums, local media etc at the cost and consequences of the BM and bank. You may mention that the practice of the bank is in violation of RBI code and guideline set for the banks. You may mention the cost of your representation and reminders and demand the same in cash/ cheque from the bank.
Ask the bank to beg apology in writing supply all details demanded by you, and commit in writing that bank shall adhere to the law of the land.
Kindly update the response of the bank.