Disappearing DATA!!!!!!!!!

I have logged a case with this useless call centre/ back office regarding my 3 gig disappearing within a week & I was simply told turn off your mobile DATA lol !!!!!!!!!!!!!!! Since this is the only way I get a proper response from CELL C I will post how pathetic this network is.. I get 10 gig day and 10 night. I have never changed my usage habbits but for the past 2 months my data has been disappearing. I know how to use a phone, I have no apps running in the background, no updates, I do all my updates on my wifi, all my series downloads are done with my night data, so I would like to know where my 3 gigs went to & if I get a call telling me to switch off my data I will end up slapping someone. Yes Fezile you rude service agent, instead of helping me she kept talking on top of me saying i must turn off my mobile data, what advice is that?????? Cell C cannot provide a reason I lost my data except it was internet usage?? Well duh!!!!!! I want my data back I am sick and tired of this ****************!!!!!!!!!!

CASE LOGGED ********** 747