Vodafone India — balance getting deducted automatically

I have not subscribed to any value added services, nor have i purchased anything ; but my balance getting deducted automatically . I have recharged on 20/11/2017 with rs. 50 . The balance was Rs. 43.81. Everything was fine, until 25/11/2017 . Within a hour rs. 40 have been deducted without any reason whatsoever .I checked whether i have any value added services activated accidentally, but i found none, no vas was active . Everytime the message " Please enter 1 to purchase, or enter cancel to dismiss " - I pressed cancel . Rs. 40 got deducted within a hour . I am extremely concerned over this issue . I request to resolve the matter at the earliest .