Kotak Mahindra Bank — Getting harassing calls for payment

Address:

Mumbai

This morning I got a call from an advocate stating j have dues left with citi finance and as it's taken over by Kotak Mahindra, they have filed a case against me as there are dues pending. The person asked to visit a branch within 2 hrs and pay the amount otherwise the FIR will be registered against me. He also gave me steps how to pay using online use the BillDesk option for Kotak. I denied the payment, after couple of hrs one lady called stating she is Seema (Branch Manager); and wanted to know if I've made the payment as the case is in hold. I asked her to send ne an email however she was insisted on visiting a branch and they will send an email to the branch, i feel this is fraud and they are looting people in Kotak Banks name. I just wanted to know if these calls are genuine and if Kotak has authorised these agencies to collect money.
Regards,
Roshan Colaso