Vodacom billing me excessively and taking the a,ount out of my account

I recently app**** for a bond and was told that my monthly repayments are too high. I was given a number to phone and get a report. To my horror I saw that Vodacom instalments are almost R13,000.00. I logged onto my internet profile and saw that I have been deducted that amount. I quickly phoned 082111 and spoke to a consultant who gave me a list of numbers on my account most of which I do not recognise. The invoices she called out was all high amounts. I do not take out expensive contracts. (never have and never will). Vodacom what is happening here and why are other numbers added to my account and why am I being charged for it. Also explain to me why some of the lines are way more than the amount I took out the original contract for?