Confused and very very angry!!!!!

<p>I cannot understand why I am paying so much on my vodacom bill each month. My account for december is R2145.39 so let me explain my subscribsion and all chrges for the cotract is R933 and i get 400 minutes and 800mb data free per month now on my itemised billing it says ive used 1.9 gb for the month which in actual fact minus the (free) 800mb translates into 1.1gb usage now my call and sms charges are 0.00!!! and then the charge for the 1.1gb data amounts to R1065 now how in the HELL can I be paying that for data???? Pre paid data is R189 odd for a gb please someone explain this outrageous amount per gb to me? I went to our local vodacom office and i was assured that this wont happen if i keep my data usage low ( as i have been paying these outrageous bills for the last year or so) we migrated to a cheaper plan as well i switch off my data and did not download anything except on whatsapp on very few occasions i put my phone on flight mode when playing the existing games. So my usage is very low taken over the course of a whole month!!! How can i sort this out ????? I cannot afford this ANYMORE!!! </p>