Poor service

We are currently paying over R800 for a 4mbps line but have been receiving only 0.04mbps for the last few weeks. I have tried absolutely everything to get hold of someone. From being held on the line for 40 minutes and then disconnected, emailing, three messages to their Web chat with no response, tweeted and posted on Facebook and logged an automated fault thingy....I have yet to believe this company actually exists!! If this is not resolved soon we will he switching to Afrihost.