cell c data

the past days i check my mb data closely because each time i run out of data or airtime . I bought the whats-app bundle every month but what i did not know is each time i went on whats-app my data or airtime keep slowly dissapering without me going on my internet .

I had speak to a call centre agent regarding my problem and before that i check my balance of data was 20.36 and today i check again its 14.50 and i only used whats-app on my mobile phone

I had the done the *133*1# block content billing but still the problem occurs .