Airtel Prepaid
Automatic Balance Deduction

I am having a prepaid airtel connection 9867676841 in Mumbai region.

Many times some unwanted services (VAS) are automatically

getting started on my mobile. My prepaid balance is constantly being deducted

for such unwanted services which I never want. Many times I called on customer

care & requested to STOP these services but after few days/weeks again some

other/new services automatically start & deduct the balance.

Can you please necessary steps to STOP such undue balance deduction against Airtel?