Bad Service

The service is very bad, I was told that this is not a contract, it’s a month to month deal meaning you get a service whenever you pay. I was never told that whenever you decide not to use the services that particular month I have to tell them. In November last year I didn’t use their service because of finances, next thing I’m told that there is an outstanding Invoice for that month, now they say I must pay for that and I told them I can’t pay for something I never used. I was helped by Nomthandazo Sabelo, she said she will will escalate my issue, next thing I’m told I have to pay for that invoice. How do I pay for a service I did not use? I needed connection on the 4 of March then she said I can pay for March service, I paid for March service but almost the whole month I didn’t have connection, when I ask her to assist, she’s telling me about that November invoice, but my issue is that why am I struggling this month when I have paid for the service? I have been requesting them to call me for 2 weeks now no luck, when I call I can’t get through. I’m not a happy customer right now.