Absolutely disgusted with service and lack of follow up.

I am having a terrible time with Webafrica/Vumatel in terms of service. I have a 100/50Mbps line with Webafrica with Vuma Reach as the infrastructure provider at my mom's house. I was there this past weekend and noticed that her WiFi connection was extremely slow and ran several speed tests both wired and wireless and never got in excess of 48Mbps download speed. I then contacted Webafrica via their Whatasapp portal which seems to be the only way to contact them and since Satruday my ticket has been escalated 6 times and we are now beyond their 66 hour self imposed limit with current speed around 20Mbps. Why am I paying for something it seems they are incapable of delivering and what will be done about it? I don't reside at this address and I have no idea how long this has been an issue and yet they are more than happy to take my money every month without fail.