Poor service and now they refuse my cancellation

I am on their fiber service. since the beginning of this month, I have not been receiving services. over 16 days with no service. i have logged multiple cases now because they close the cases without resolving the issue. Every time i call them they tell me about escalations but not update after until i make another follow up and i hear a different story. Just today i made 2 follow up calls to them. I am now requesting them to cancel my contract and the lady assisting me is refusing and telling about a month's notice starting from next month? why the wait when i have not been receiving service for the rest of this month and the same vodacom is that one committed to refund my money for the days of no service? why must they keep me at ransom when they are not able to provide the services. i am using my phone data to hotspot my devices and even running out, yet they want me stay on for another month.