INCORRECT BILLING FOR ALMOST 1 YEAR

I am on a uChoose Smart M with Vodacom which is a Top Up contract with Autopage from July 2014 where I paid a subscription of R517.20 per month.In September 2014, my phone was ******. The line was blocked and I then did a sim swap in order to be able to utilize my personal spare handset. It was from the time moving forward that the billing became irregular in that I was billed amounts between R1000.00 and R12,000.00. As I could not afford these amounts I would contact my bank to have the amounts returned. They were then unpaid. I also lodged numerous complaints with Autopage as they would then suspend my account as it was not paid. My plight now is that it is the fault of Autopage that I was being billed incorrectly which has now resulted in me having to use an alternate cellular contract as Autopage suspended my usage. I have not had the usage of my phone for almost a year now. I am now made to account for an amount in access of R10,000.000 and have been added to ITC and now have a bad credit rating.