Out of bundle data

I signed a 2 gig data bundle contract for +/-R150 per month. I assumed that when the 2 gig runs out I would have to wait for the next month. When large unexplained amounts started disappearing out of my account I found that Mtn had debited my account to cover out of bundle data costs. HOW is it possible that for the same product I paid R75 for, Mtn can hike the price to R2000.00 in a microsecond???<br> <br> Over R2 500 for 2 months and R3 500.00 I managed to stop. I immediately informed Mtn that I am not paying the R3 500.00 and am prepared to defend the matter in court. The next thing I receive an email demanding R6600.00 from their lawyers. Followed by a daily email with the amount increasing at R10 per day. <br> <br> This despicable company needs a class action suite to stop its abuse of ordinary south Africans. Please email me at [Email Removed] if you are interested in joining a class action.