Vodacom *****ing my money!!

It has been months now that Vodacom is refusing to send out a technician to fix the fibre line. the dropped off the router and that was the last I have heard from them. Charging me for 100mb line where i'm only getting 1mb in reality. I have sent them all the speed tests that they have requested, lan tests wifi tests, been on hold for hours while waiting for call center agents to assist and still nothing. They have you in a corner with their debit orders and as a consumer I have no way of rectifying the issue. I am being ********** and now they are starting to ***** my money as they refuse to give me what i am paying for.