Kotak Mahindra Bank — Deducted money from my account(Hidden charges)

Address:	Bangalore, Karnataka, 560031
Website:	www.kotak.com

I have been using Kotak Mahindra bank account from 6 years for my Salary account, 8 months back I have traveled to abroad on my job so obviously salary won't get deposited to that account anymore but still I was using the same account to transfer money from aboard but I was doing even more transaction with compare to early, almost after 8 months in August I saw a debits from account saying minimum balance not maintained in May 15, and again on the next Day another Debit minimum balance not maintained on April 17 like that.

I called customer care and enquired them the reason for money deductions without any proper communication, They said your account is now converted from salary account to some different account, minimum balance for that is 50K

They didn't send any kind of notification about my account converting to diff kind of account. They said they will not send any notification it will be there on T&C when created the account.
I asked them if minimum balance was not there on some day of May why are you charging for it in August. one guy gave reckless answer saying they can deduct money at any time whenever they want.
though they are not sending any notification, if they would have deducted the charges on next month for May, I would have got to know about this minimum balance and I would have maintained it properly from next month but they are deducting after 4..5 months for all the months before...

They are playing tricks to deduct more money from customer... I asked them do you have anywhere in the T&C saying you can deduct money at any time, they don't have proper answer for that.

I wanted to escalate to their floor manager and senior manager, they made me wait for two hours in call and even mangers was also giving reckless answers like they can deduct money at anytime and it won't metioned in any terms and conditions.