Zestmoney — Credit department and customer care

I used zestmoney to purchase some subscription but later they did not pay me the offer cashback and then i tried reaching out to them.
After multiple attempts i could contact zestmoney but they delayed the cashback and then i posted on twitter.
After that i used to get regular calls from them to take loan even after i denied them to call.
And one day i got a call from someone pretending to be zestmoney regarding my case, i made a mistake and gave my otp and they got a loan request but I understood my mistake and dropped a mail to the official email and after multiple contacts and calls i got that loan cancelled and asked the fraud department of zestmoney if my account is now safe or not as i mistakenly shared otp and all that happened. They asked me to not worry as they have resolved the matter. I even asked them to close my account if any problems are there as i shared the otp. But they asked me not to worry as they have done the needful.
But a week later some fraud transactions took place from my account worth ₹500 around, i immediately called the customer care and asked them to block my account as i was not the one doing them. But they said they don’t have any power. I talked to multiple representative and after 3 hours of calling around ₹4200 transactions already took place but then later i was able to stop them from doing it. It has been 6 months i did all they asked me to and i am being harassed by zestmoney credit department as they call and constantly ask me for the money even I explained them multiple times that i have given all the information to the customer care and even to the credit department but they call and talk aggressively. And on every call they ask for more than the due amount, they even include the amount that i have already paid back and every time call me with the wrong amount and after 10 mins of explaining they say ok pay the amount excluding what you have paid.