Kotak Mahindra Bank — without my permission they change my account type

Address:

2/133g , murugan kovil, mayyam pillaiyar kovil street , salem road , Namakkal, Namakkal, Tamil Nadu, 637001

I am open the 811 zero balance account on online, i select the branch in namakkal but few days after some kotak authorised persion contact to me for proofs & biometric verification after verification one half month after i get sms amb non maintenance charged 560rs four time debited total 2240rs after i ask cc they told my account type is classic account minimum balance maintain 10000rs, i told all info they return only 500rs bal amount not returned that persion without my perimission he change my account type he didnot told any information, i am so many time approched my home branch they never give proper solution and answer after i give colsing form but thats also waste my account is not closed