Vodacom Fiber is problematic

I recently got fiber 15 Meg line in Kensington Cape Town area from Voadcom. Have had for 4 months give or take and continous problems. After phoning them endless times regarding the problem they have not resolved it. The then send me and email stating that they have increased my spead and ur it's still the same as it was. No throttling my ass. False promises to get you to sign. When I do a speed test via one of the most trusted speed test platforms on the net. I was told that I can only use Voadcom speed test. Yet the trusted speed test come out lower than Voadcom speed test. Looking for new service provider!!!