ADSL 4mbps line never seems to work

I took out a 24month contract with telkom for ADSL (4mpbs line, 20GB cap). Most of the time the internet does not work even though the internet light on the modem (supp**** by Telkom) is illuminated. I have rebooted the modem and rest the settings countless many times. A Technician from Telkom visited our home today and confirmed that the lines are congested and may not work during peak times. <br> <br> As far as I am concerned, this is a breach of contract - I am paying my monthly fee and am not receiving my internet service as contractually agreed. I would like to terminate this contract without prejudice or the service to be restored. Thank You.