Most pathetic ISP ever

The best ISP's are always named, but what about the worst in South Africa? I would have to name Supersonic as THE worst and most pathetic ISP. We are supposed to have a 500mbps link with them that worked fine for the first 2 weeks of the subscription. Then it dropped to 12.7mbps download and 239mbps upload speed. Ping to a game server is 320ms. We have logged numerous calls with them to resolve the, but NOTHING gets done. They always tell us to send screenshots of the speed test and after it is sent, we get NO feedback. When phoning them back again we get told that the 2nd level support only works until so we will have to phone them back the following day. The following day they will say that it has been escelated to 2nd level support.Really!!! Still nothing has been done in 2 months to resolve this. DO they only have 1st level support and then refuse to give customers feedback. THIS IS BY FAR THE WORST ISP I HAVE EVER ENCOUNTERED. Do not waste you money on these people, rather go to a proper provider! Does not look like they have been trained on customer service.