I am being ********** in broad daylight!

I received a call from a Cell C consultant in December 2015, saying I qualified for a tablet deal they were offering. I was told I would get a tablet and 1GB data, for R89. Sounded like a good deal to me, so I signed up and bought it for my mother. I got the January statement and it said they would deduct R105.00. I was fine with this as I assumed these additional charges were for getting a new sim card and so on. We received sms' saying the account balance was R250, then later R800. This didn't make sense as I got the tablet in January. I then called Cell C to enquire what was going on, and the consultant told me that the contract was an open line and was for 500 MB, and if I deplete the data I had credit up to R2000.00. I explained that this was not explained to me, otherwise I would not have taken the deal. They then went on to tell me that next month (February) they would be deducting approximately R1400! Such ridiculousness!!! A consultant called me and it seemed like I was being helped, until he stopped calling and responding to my emails. Can this be fixed as there is no way I am paying R1400 for a tablet with 500MB?!? They can take their device, I am not interested anymore!