Worst ISP in the WORLD!

PLEASE STAY AWAY FROM SUPERSONIC ISP! This has been the most awful experience possible. I had internet set up in Cape Town and Midstream, both with supersonic. I cancelled the supersonic Midstream setup due to effectively no internet connection and no response from supersonic and moved to a much better ISP. Out of spite or sheer incompetence they cancelled my Cape Town service and continued billing me in Midstream. (To make matters worse, they even admit to having done it, they assigned the Cape Town Router Board that THEY installed, to another ISP.) I have spent MANY hours of my phone time and cost trying to sort this out. Supersonic ADMIT that they made a mistake but the buck gets passed from one to the other since five days. Supersonic are totally and absolutely *********** and, I suspect that they scrub data on customer call-in logs as there appears to be a sanitised record when moving from technical to sales to accounts over the last days. I am now forced to cancel the account and find another ISP. Is there any way to give a negative rating!?