CELL C FIBRE THROTTLING MY LIVE STREAMING PORT.

I signed up with Cell C fibre 8 months ago for a 20/2 Mbps line. For 7 months every thing was fine but the last 4 weeks my download live streaming has been buffering very badly. Checks on my line speed show that I am getting my correct download speed but I am being throttled on my live streaming port - hence the buffering. To prove a point a rival company came with a portable router using a Telkom line connection with a speed of 15 Mbps (not even fibre), connected to my TV and my picture became stable with no buffering. As a further demonstration of their attitude I sent Cell C an email giving them 20 days notice of my cancelling our agreement as per the contract but they don't even bother to acknowledge receipt of the same.