Bad service!!!!!

Got an SMS to pay R94 before my payment date, like it normally does every month and I paid, and then last Sunday my services got disconnected and i called the call center and the automated machine told me to pay R55 and my services will be active till my next payment date next month, I paid and tried to reconnect on whatsapp but it didn't allow me and so I called again and the consultant told me that it was a system error and my account is up to date, and then today my services got disconnected again and when I called they saying I must pay R300 and something of which I don't understand why cause I paid what their system told me, now they telling me that they going to double debit me next month of which I find unfair cause their system misinformed me and even their self service of which they always encourage us to use it, I'm so disappointed cause I've never missed my payments but now I have to suffer whilst it's not even my fault