Is this *****ulent billing?

Webafrica has been billing me between R100, and R200 extra per month, depending on what number you look at. I have one number which is on my invoice as a single line item. I have another number shown on my service which is R100 less than the invoice. I have a third number which is R200 less than the invoice listed should I downgrade my package to the same package. I'm currently paying more for my current service than the top of the range service. I've been trying to get resolution, but the only channel is via Whatsapp, and the agents either aren't trained, aren't empowered, or don't understand. There is no way to email and my repeated requests for a manager to call me have been ignored