Data and airtime

I phoned the call center and asked for assistance because everytime i recharged my data dissapears i recharged with 500mg and in less than 15minutes 300of data was gone,so i founed cellc so they can check or stop whatever am subscribed to and i was told that they cant help me because i failed security questions,i mean who remembers all the cotacts in their contacts list please am asking for help and u think i stole a foun and please maan,do u think i can take my neighbours foun and inquire about my data,i felt really angry as i wanted to stop whatever it is that is consuming lot of data.ai really maan