Slow speeds, no reply from support

My fibre speeds have been unusable (under 1mbps) for the last 2 days, and Home-Connect's support is ignoring my support tickets.

Since there's no way of contacting them, and they aren't replying to my support tickets, I went to Facebook and commented on one of their posts with my issue, however, within 15 minutes, they deleted my comment and turned off commenting on their posts.

I now feel helpless and I'm unable to work, as I work from home.

I tried cancelling to switch to a different ISP, but when I wanted to submit my cancellation, I got a message saying that I'll have to pay R2500 for "installation fees", when nothing was actually installed here by Home-Connect (my previous ISP installed everything and Home-Connect was never at my residence).

I've been with several other ISPs before but this has been my worst experience thus far.