NOT TAKEN MONETORIUM AND HARESHMENT BY FINANCE COMPANY

SIR I HAVE A PARTNERSHIP FIRM ME AND MY WIFE IN IT .I HAVE TAKEN A BUSINESNESS UNSECURED LOAN FROM FINANCE COMPANY BEFORE LOCKDOWN .I HAVE NOT TAKEN ANY MONETORIUM FROM THE BANK AS THEY HAD NOT GIVEN AT THAT TIME . NOW THEY ADDED THE MONEITRIOUM INTEREST AND CHARGES IN MY LOAN STATEMENT AND AS I TOLD THEM TO REMOVE IT THEY ARE NOT GIVING ME ANY REPLY .AS 2 EMI ARE PENDING FRO,M MY SIDE . THEY ARE TELLING YOU CLEAR YOUR DUES THEN WE WILL REMOVE YOUR EXTRA AMOUNT THEY ADDED MISTAKLY THAT TO THEY ARE SAYING ON CALL NOT IN WRITTEN .NOW THEY ARE HAREESING FOR THE EMI ME AND MY FAMILY .I TOLD THEM CLEAR MY PROBLEM I WILL PAY MY EMI STILL THEY ARE NOT LISTEN. SO THAT LEGAL Can i do in this case beacuse mistake is thiers and telling me they will send legal notice . in this i want send them something legal beacuse of torture they are doing please advice what i should do