Kotak Mahindra Bank — wrong transactions

Hello sir,
My name [censored]al deshmukh. I had a salary account in kotak mahindra bank. I have this account since july 2018 years, i have converted my account to saving account on 7 march 2019. I recently go through my account activities/ past transactions and found that kotak mahindra bank stating deduction of rs 2360/- from my account without any kind of prior intimation.
1) when the salary account was opened i was told that it will be a 0 balance account (So how the non maintenance charge was deducted)
2) secondly my account balance shows amount deducted rs 2399/- for non maintenance on march 20 for month august 19 to november 19.
What kind of a bank is kotak mahindra, that they charge deductions wrongfully??? That too without any prior intimation
Is this not some kind of a scam going on???
Is it not many people in this complaint board suffering from similar grievance like mine???
We seek your help. Please refund my hard earned money back immediately or else i will have to close my account and say good bye to kotak forever.