INTERNET SPEED PAYING FOR 4MPS GETTING 1MPS

I have a 4 MPS ADSL line and at best I get less than 1 MPS. I have complained three times requesting that the problem be resolved. A technician test the line three Sundays ago (I was impressed). He promised that the exchange will be fix three Mondays ago. I phoned him 5 times - no response nothing - AWOL. I escalated the complaint at [URL Removed] - promise to phone - still waiting. I responded to a SMS survey - Telkom promised to phone - still waiting. Tonight I get a message stating that the line is fixed - a joke - download speed of 0.62 MPS, upload speed 0.32 MPS (Saix - Rosebank). I spoke to a Telkom technician who stated that the exchange was congested - wait in line and if people in the area complain then perhaps Telkom will fix it. Why do we have to pay for a 4 MPS when only getting 0.5 MPS - it is a *******! Write this note is at a snails pace