Extremely poor service

When making payment I was asked to make a payment of R399 for my service, 3 days later I noticed that I was charged R249, 10 days later my internet was diconnected. When chatting to the service agent on whatsapp I was told that I have not made the correct payment that is why it was disconnected after that he tells me that I was charged pr rata and that is why I was charged this amount. My online portal says that I am not in arrears and that my service is active, amount owing is R0 and it is not allowing me to make any payments so I dont understand as to why my service was disconnected. I have asked for a manager to contact me and it is now 12 days later an still no call from them, when I call in it goes to sales and the as well said that they will escalate the matter but still no call. I am working from hkme and for the past 12 days I have no internet access. This is very poor service as I cannot get trough to someone that can help.