Vodafone India — added vas amount in the bill amount

Address:

Kamrup Metropolitan, Assam

Hi team,
How could i raise a complain against vodafone, as company has added vas into my postpaid bill amount and now denying to revert back the amount. The same case i have seen for may of my friends and my son.
Is this a new way to loot people hard earned money?
My usual amount used to be around 400 -500. (With 299 plan) now it is showing 2400/- now i am not able to do number portability as well.
Any help would be helpful.
Here in my case i would need to retain my number.

Your faithfully,
Indian citizen.