No help, they do not care

I have 2 contracts with Autopage which ended a few days ago. I have requested them to convert these numbers to pre-paid at the end of July which they promised they did. Last week they cur of the one number and when I called I was informed that it is because I did not make my last payment. I was told before that the last payment was in July with a previous query. My previous deduction was also not correct (they deducted too much) and when I queried that they indicated that it will be rectified. that they did but the next invoice was also incorrect. I deducted the amount which was too much and paid the difference which should then result in my account to be R0.00 (paid up) and I forwarded the proof of payment. They have now again terminated the one number even after I have informed them that they made a mistake again. I cannot keep phoning them to sort out there problems, that also costs me money