Shocking service from Vodacom Fibre

In July I upgraded my lines speed for my fibre and since then my fibre is very very slow.i logged a sr with them and a month and a half later still no feedback .I have called Vidacom everyday this past few weeks and I'm told due to covert they are working remotely and excuse after excuse. I was promised by 4 agents that their supervisor Grant would call me back.all lies . But they are taking my money every month and no service.shocking service from Vodacom. Disgusting