Vodacom sucks and has no feelings towards their clients...

I have been a client of Vodacom Fibre for a year, it was a month to month contract. Since Dec 2020 I have been experiencing issues with my 20meg line where I did not have full functionality e.g. no access to banking, video & voice calling, online games ect. I was also disconnected from Dec 2020 to Jan 2021 for more than a week. I logged the call advising what my issues were they still debited my account for more than R2500 for a 899 contract In December, I asked them to credit my bank account which clearly did not happen. My full services was only restored after an agent reloaded the software on my router in July 2021, imagine... From August to October I have had weeks of outages, this is with me working from home my company contributing to my fibre line. Every time I was offline it would be for days on end or even weeks. I have since cancelled my service with them on the 13th October 2021, they are now hitting me with a bill for R1500 even though I cancelled and stopped using their services. Can someone please advise whom I can take this up with as these ppl are robbing South Africans of their hard earned blood and tears... I have logged hundreds of calls and they could not be bothered. Desperate pls