Poor Vumatel Fibre

I have a Vodacom / Vumatel 100mbps fibre line at home. I have been experiencing slow and interrupted internet for the last couple of months. Vodacom responded to my previous review and replaced the router and double checked my settings. My line is still not fixed. I have to wait for Netflix and YouTube to load before a video is played. This with a 100mbps fibre line? My friends have a 20mbps fibre line with a different provider and he can play multiple devices without any loading issues. Please come to my house and sort out this issue.