AIRTIME DISAPPEARING.

I have been buying airtime amounts of 30,40,50,60 for almost 3 weeks and almost instantly with all my data settings switched of MY AIRTIME disappears. I've called Cell C numerous times. And all I get is a silly answer that I'm using internet, if I was using internet I wouldn't call them. They're useless and unfriendly. Cell C advertise free stuff but you really pay for those things. The consultants have absolutely no idea what they are doing. It's silly and useless calling them <br>