HDFC Bank — cancellation of emi within 45 days but cannot connect customer support and phone banker

I want to cancel the Emi of ₹2, 00, 000. Booked on 15.4.2020 on my credit card, but customer support and phone banker not available, Im trying from 20.4.2020 to connect but cannot contact them to cancel Emi now they will charge evry month untill Emi gets cancelled what to do

It is not my mistake now that I didnot tried to contact the hdfc cc department to cancel Emi.. I have also mailed on the services.[protected]@hdfc for the cancellation of Emi and they repliet with a refrence number now how to cancel the Emi as days are going and I will be charged to pay Emi untill it is cancelled