Bill Shock, bad service and non communication

In December 2014 I received a call from one of Vodacom's consultants, telling me about a 2G router (TopUp), only to find out that he made my account an Open account. Throughout the months I never exhausted my data until April 2015, when I received an sms that I owe R6000> After investigations Vodacom discovered that indeed I was put on a wrong contract, but they suspended my account and still told me they were investigating. I even went to Vodaworld to query the whole thing, I got the same message, they are investigating and will get back to me. Nothing happened until I wrote to Hellopeter, in July, I received an sms from Waseema Martin they are attending to my query and a consultant will call me. In October I wrote to HelloPeter again about the same query, Vodacom rep**** that they are attending to my query. Now I received a letter from Vodacom that my account was handed over to the lawyers and that I have been blacklisted because of breaching an agreement. Prior to receiving this letter, I never received anything confirming that they are done with their investigation and their findings. Please assist.