Vodacom'S horrible service

Greeting, I am Mafuma Lilly. I have contacted vodacom a couple of times to fix the connectivity of my wifi still date it is not connecting or they refuse to connect it yet deduct money every month. It's been 5 months now with them deducting my money and not connecting it, I called them several times and emailed them several times I was told that it's not their problem that the WiFi is not connecting they have to deduct or they would say the technicians will fix it but no such thing happens. I called them and emailed them to cancel it still date they don't. I am basically paying for a service that vodacom is not even interested to render yet they make no mistake when it comes to deducting my money. I would like the WiFi to be cancelled