Slow internet speed + no technical support

I have been an Mweb customer for many years, I started with a 1mb adsl line to 4mb to 10mb and 20mb. On the 10mb line I was getting very good speeds 9+ almost 10mb, then I upgraded my line approx. 2 months ago. Since I've upgraded to 20mb I have only seen close to 15mbs for approx 2 weeks, my speed rangers from 4mbs to 11mbs on any given time. I cancelled my DSTV hoping to watch the sport online, but that seems to be impossible as I cant even stream 480p without buffering. So I tried calling customer service at 7pm as I get home at 7pm and then I find myself waiting in a long telephonic line, when someone finally answers it is time for them to go home as they only work until 8pm. What internet service provider does not provide 24hr technical assistance? (your product is suppose to be 24hrs) I then tried to get assistance online via Mweb on Facebook, the person that was assisting me left the chat without even letting me know that they leaving. I then left a message on the Mweb website, I typically get a response the next day saying they performed some test and that it should be good now and that I should contact them if the issue is not resolved. I reopened that case so many times that I gave up, the slow download and upload speed still exist but I'm being charge full every month for an inferior product. Extremely poor technical support.