Ready To Take Legal Action At This Point

In 2009 I received a Woolworths Credit Card. On the 6th April 2011 I paid off a debt of R22 251.63 on said credit card and sent through proof of payment to Woolworths' collections agency and never heard from anyone again. In May 2015 I was told by Norman Bisset & Associates that I owe 10K on a Woolworths Credit Card I don't have. I resent the proof of payment. Today on the 23rd July 2015 I am still Blacklisted, which is affecting my business, and Woolworths Financial Services/Collections have still not bothered to rectify this issue. I have exhausted all my energy and resources phoning these people at first daily then weekly to find out if anyone has bothered to resolve this issue. Norman Bisset have washed their hands and sent the debt back to Woolworths and Woolworths, well they just don't give a damn. So I am left to ponder what exactly the Woolworths Difference is, other than ruining small businesses by getting people blacklisted for a debt that doesn't exist and then not bothering to investigate or rectify it. You deserve to be sued but I know I'm a lowly nobody in the face of your Million Rand lawyers. You're disgusting and should be ashamed.