Vodacom Fibre slow connections, like their service, SLOW

I have been having endless problems with my fibre connection, always running very slow, router drops connection multiple times in an hour. You charge me an exorbitant amount to have a 40Mbps line but I only get between 1 and 8. Will you credit me the times that it is below 20Mbps, because most of the time it is that low. Logged 2 requests for low connection speeds and still no one has bothered to pick the calls. And previous calls are completed but my connection is still slow. We are getting other SPs to install lines in our complex, maybe I should move to them.