Indusind Bank — personal loan closure

As per company rules I submitted cheque with bank letter to close personal loan. After 10 days I checked that loan is not closed. When I visited bank at that time bank employee told me that by mistake he wrote wrong account number in slip so cheque was not clear and also he forgot to informed us for revised activity.

Now bank tell me that you have to pay interest of all these days.

Why I should pay interest. It is bank mistake then why they charged me??

No one bank employee pick the call and update status. I submit bank complient but after 10 days no one answer me.