Poor Fibre

I logged a call on the 13/09/2021 regarding my Fibre line. My line speed is slow or no speed at all. I have been trying to resolve this for to long. All i get told someone will call me but nothing. Vodacom also had a promotion where your line speed was dabbled at no extra cost but even that was not load ony line as inwas informed. I need this resolve or rather cancel and go to another provider. My reference number SR***