********** billing that has not been reversed

I have received a letter from Edgars advising me that I had a balance of R101.35 dated 15/07/2015, but I had not bought anything for about a year or more! I went into the Vangate Mall Edgars branch to query this bill and was advised that it was Cell C prepaid that was bought from a cell no ***. I do not have Cell C I am with MTN, The service from the staff was very poor, I had to wait at least 40 minutes after which staff advised me that the issue has been resolved and will receive notification in the next 24 hours. I am still waiting for the notification but what I have received is another letter from Edgars demanding R128.32 (interest of course) advising that my credit has been suspended and that this has been recorded at the credit bureaux which may prevent me from obtaining credit from any other organisation. I would also like to mention hat this not the first Edgars done this to my account, a few years ago the same thing happened but for over R1000. This very upsetting and I am considering legal action if my credit reference has become compromised because of Edgars incompetence! They also gave me the reference *** and still they mess it up.