INCORRECTLY BILLED AND NO ONE IS ABLE TO HELP

I upgraded my 'close contract' of data, airyime and phone on the 26 september. The consultant left my data contract open and i got no notification that i am now on open contract, they billed me R1152 for data which I did not contract for. When I call them, the consultants are sending me from Pillar to Post which means THEY HAVE NO CLUE ON HOW TO HELP ME😢, i have been with MTN for years and never have I ever asked them to give me an open contract. Why I must pay for their mistakesis beyond me. They debited my account with R1152.... This is seriously wrong and had I not already signed up, I would cancel their Services COMPLETELY BECAUSE THEY ARE BULLYING ME INTO PAYING SO MUCH. SO THERE I am disappointed in their lack of care for my complaint. I have a pile of ref numbers but noone seems to know how to help me🙃