HDFC Bank — Fraudulent Manual Debits on HDFC Fastag Wallet

My Fastag wallet was debitted for Rs 832 and Rs 200 and when checked it was showing as manual debits without any more details. I have been trying to sort this out for quite some time at the call center.
To rectify this, they are asking for details that they already have and not sure why the consumer is being penalized for no fault of theirs..

On top of this, they have also sent a message that they will be taking away my security deposit for the negative balance caused due to this fraud.

Not sure how to resolve this.