Blacklisted by Autopage

My account from Nashua Mobile was transferred to Autopage. My service has been suspended on a number of occasions since February 2015. My account is paid by debit order. At first I was told that there had been a billing error and that the problem would be rectified. Since then monies have been deducted from my bank account every month. then my service was suspended again in May 2015. When I queried I was told that I have an outstanding balance of more than R1000 for data usage in March 2015. I have been engaging with one individual at Autopage since then to resolve this issue. to date I have been unsuccessful. he continuously promises to investigate the bill and get back to me with an explanation. I am still waiting for this feedback. During June 2015 I app**** for a home loan and was advised that I have been blacklisted by Autopage. Again a whole flurry of calls and emails and I am not any closer to resolving my problem. In addition I then discovered that my original contract with Nashua Mobile has been changed my Autopage. I have also sent an email to their customer service address and am still awaiting feedback.