Nokia2330
Charges being levied without usage

I have the above handset where in my children have inadvertantaly gone to the game downloads. Now i find that i am being charged some amount of currency for game downloads even though we are not downloading. I found from airtel that they have nothing to do with it.every now and then i get a message indicating the amount of deduction.

my mobile no is - 9845717871

please clarify.