Kotak Mahindra Bank — Amount holded in the account.

Address:

Branch- Ratu Road, Ranchi, 834001

I am a customer of Kotak Mahindra bank.
I have kotak 811 zero balance savings account in which i do not worry about maintaining the minimum balance.
but yestreday when i credited about 950 rupees in my account then it is holded automatically and did not show in the available balance.
I contacted to the customer care of kotak bank but they told that it is holded as lein balance and it cannot be refunded .
Please help me to get back my hold balance.