Airtel — Automatically my bank balance deducted without give any notice to me

Address:

India

Hi, I am using Airtel prepaid sim (+91-[[[protected]]]). At present I am using it. Today I had around 209/- Rs. balanced in my account, but all of sudden whole amount deducted and I just got 0/- Rs. balanced. I requested for STOP due to this automated deduction problem. Could you please advice on the amount deduction charges and how to avoid this? As I have not activated any service, please advice and arrange for refunding of auto deducted balance.