Useless, rude and unhelpful call centre agents - Supersonic

After months of connectivity issues with my plumes I have been pushed from pillar to post by rude and unhelpful call center agents for 5 days. I have today 11/04 been placed on hold for 18min by a call center agent named Lehlohonolo who kept me holding and did not respond to my requests for feedback on the chat that he had opened. When he eventually returned to the call and I shouted saying that he had me holding for 18min with no feedback he began to speak over me and when I shouted over him he put the phone down. I called back requesting to lay a complaint to the supervisor on shift and after 10min I was put through to the same person who I wanted to make the complaint against. The still rude Lehlohonolo then would not accept that his handling of the call was poor. He refused to give me the name of his supervisor or the name of the second in charge saying that he could not give me any names and someone would call me back. I pay R1100 per month for a fiber line and 4 plumes on time for the last 2+ years and can only connect when sitting right next to the router. It has cost me thousands of rands in extra data charges and all supersonic give is useless, rude call centre agents! Whilst typing this review I am again on hold for 20min!