Paytm Mobile Solutions — Collection Agents Not showing ID Card of tell their real names

My Paytm Postpaid was not paid and I have sent mail to NODAL officer regarding repayment time extension. But the Collection Agents continuously calling and messaging from multiple numbers for several times in a day which leads me mental stressed and affect my duty that put me inferior and slow my earning progress. As per my advocate advice, asked them to show their ID cards and ask them to send through official mail ID. till date they didn't show or send. Meanwhile, Paytm is levying charges and interest every month. Collection Agents torture is unbearable and coming through various numbers and after several days, I am complaining here. I don't know whether this is done under the permission of Paytm or following the RBI norms. Let me file complaint with RBI also regarding the same.

Some of the messages i have received through WhatsApp stating FAKE Legal Notices also.