State Bank Of India [SBI] — lien amount in my sbi account

Address: Aurangabad, Maharashtra, 431003

There is a lein amount applied to my account ie 20000 rupees.
When i contacted my bank they said that your account have been kept on hold for 20000 inr.

When i dint had so much balance then only the statement is showing that you have withdrawal cash from atm (Which i don't) they have put hold on my account. I never got those money which the bank is claiming.

When contacted to my branch they say we don't know about issue, you may loose your money, so where should i go? Whose fault is this? It's almost one year & i can see my account balance as xx, xxx but in that i have 20, 000 as lien amount.
I am helpless

Pls contact me [protected]@gmail.com