Zestmoney — Emi repayment issue not auto debit from my account

As i m got fraud by zest money. As i had a auto debit facility from nach that every time my emi of zest money getting debited from my account without failure and i had paid all emi timely.but on my last emi i m getting fraud or manipulate by team ..Rs 1 not debited from my account that will be less from my emi ..and also impacted on my cibil record..too many emails or calls to zest money customer service but no one is answering. When i had sufficient balance in my account then why not debited full amount from my account..?