Cell C Really Sucks!!!!!!

I have 2 accounts with Cell C. One of my accounts has been in arrears for more than three month now due to circumstances that I do not care to explain. My second line I have been paying every month, sometimes a bit late but I have paid it and I have been using it. This month I have paid the amount outstanding so I phone in to reconnect me. I phoned and get to the correct person that is supposed to help me.... I confirm all my details and ask the lady to reconnect my line that has been paid....only to be informed that she can not connect me because I have to pay the other line too. How is that possible... the paid line can not be connected because of the other unpaid line... the two has nothing to do with each other just because it is both on my name? My husband took over cause I lost it...he asked her that how is it possible because we have been doing it like this for the past 4 months, she then tells my husband she does not believe him... we have a recording of the conversation with this consultant. I would love to know how you cut a line that is paid up to try and force a client to pay the line that is outstanding?? I paid for service that I can't get?