lte package

3 Months ago i took a LTE contract which was explained to me as 10gig for R355.00 per month, for the past 3 months i am being billed R859.00, i have made numerous phone calls and finally spoke to an agent in the call centre accounts dept who started explaining a whole lot of details about out of bundle billing and stuff which i could not understand and which was never explained to me, another agent from sales agreed that this is incorrect billing and it would be better if i cancel or migrate to a bigger package, now i am told i cannot cancel and if i migrate i can only migrate to a 40gig and not uncapped, because uncapped is only for new clients, this is the worst company and the worst call centre ever to deal with, every agent has differerent ideas and explanations of the products and how the company operates.