Vodacom Fibre deals

I have a fibre contract with Vodacom for the past 2 months. Since August my internet connection has been dropping every hour, I am dependant on my internet connection for my job , the internet has been dropping while i am on calls and meetings. I have logged calls and numerous phone calls were made to the fibre department (***). Initially I was told that they have completed a line refresh and it should stop the internet drops which it didnt . Today a vodacom technician came to my place and swopped out the router but the issue still persists, whats more disturbing is that i am paying for a 75mbps line but my line is only running at 10mbps. the technician even connected directly to the ONT and it still shows 10mbps.

I want this issue resolved or my money refunded for the past 3 months if Vodacom cannot fulfil the service that was sold to me as a client