No network and/or slow response

I have taken up a data and modem contract with the company in Aug. They had a special for R249 for 10 gigs day and 10 gigs night. Up to now i have never fully enjoyed the usage all i get is messages showing that i have used up day data which surprises me as this modem does not even pair with my apple devices. The only time i would use it its when i connect it to my samsung. The response is very slow. I dont care if they say it depends on the area you connect from, i just dont get reception from this network. Its pathetic that we are ****** like this. We pay for services that we do not get. I have even taken out the sim card from the modem and placed it in one of my devices, still experiencing the same reception. When you go and ask for cancellations because of such service and experience they tell you nonsense as if we asked for the network not to work. This is day light *******