now im blacklisted

In november 2010 vodacom deducted too much money from my account. I imediately called customer care an a guy called hercules told me that he could see that they had made a mistake and it woild be rectified within 48hrs. I waited 48hrs but nothing happened so i called again and got a lady that told the same thing that the other operator said. I then told her that i was going to reverse the debit order as i already waited 48hrs, that she should email me the correct amount so i could pay it but nothing happened. The following month they deducted even more. This was my normal subscription plus the prevoius months wrong amount. i reversed the debit order then went to vodacom to dispute the account. The whole of 2011 i was disputing the acc but nothing happened. some time after that i got a call from some guy from VVM saying i owe them R19500. I told that guy that i wasnt going to pay that amount as my numbers were disconnected and one of my contracts was going to expire in jan 2011. He then told me that the amount included subscription fees as well as hardware. I then told him im willing to pay for hardware but not subscription as i havent been using the nums sins they were disconected