How can I resolve loan case filed in Kolkata?

I am in Tamil Nadu and have taken a personal loan from Kotak Bank in Chennai branch, Tamil Nadu. However, due to loan default, they have filed a complaint case in Kolkata, making it impossible for me to appear, and they are continuing to harass me by phone. They have filed a case under the BNS Act, stating that I made false commitments to induce them to provide me with the loan and that the offense occurred in their Kolkata branch within their jurisdiction. But I have been in Tamil Nadu, signed the loan agreement at the Chennai branch, and paid nearly 15 installments. I don’t know how to handle this issue since I am in Tamil Nadu and cannot appear in person in the Kolkata court. Can anyone guide me on what to do?