Collection of paid account

I received a text message that I owe Vodacom an amount of R788.12 on an account which was cancelled during July 2013. According to the collection attorney I was listed as a defaulter and my name was put on the blacklist. Judgement will be taken and my property will be reposessed.<br> According to Vodacom I do not owe them any money.<br> I have noticed that this is not the first complaint that you have received about this company.<br> PLEASE HELP<br>