Vodacoms/Vumatel lies and don't seem to do their job properly

Vodacom simply can't get Vumatel to setup my fibre speed to 500mbps as I am paying for that, I am only getting 50mbps. I have literally spoken to almost 10 agents and no one can help, they said their team leaders will contact me, never happened, so now they are lying to customers. Vodacom just can't seem to do a simple task which I assume is part of their daily tasks, I am sure you have done it 1000s of times yet you are unable to get my line speed to the correct numbers. I am paying for 500 line but only getting 50. Why can't you fix my f***ing line. Is it so difficult to do a menial task like this?