Last resort

Hi guys, this post is really my last resort in my attempts to deal with my query. After having followed the correct procedures in the month of April 2015 for migrating from contract to pre-paid via the call centre we noticed that a month later my request had not been actioned .Many phone calls to the call centre went unanswered, several mails were promptly sent (Ref nos Reference Number: ***5) informing customer services that the request had not been actioned. More calls over the last couple of months, these were answered promised to deal with the issue and would give feedback. None to date.<br> Now demand for payment , several times actually.I explain my side of the issue, more promisses to investigate and give me feedback yet none is forthcoming. Current Ref No: for payment demand is 9A***<br> could someone please assist.<br> <br> <br>