ADSL Line Contract

I have taken an ADSL contract with Telkom in October 2013 to date. It contract entails a 4-meg line which I never got since the beginning. I have been monitoring the speed closely and it never went above 1.77Mbps and 0.45Mbps. Againg recently I have reported this matter to Telkom and the consultant in help-desk confirmed that my ADSL line was set to 2-Meg and she was not allowed to change it. She further advised me to go to Telkom shop and log a complaint there and she closed my call. Firstly I want a refund for all the previous months and need to state Telkom help-desk is useless if everything has to go Telkom shops. This is clearly a breach I am paying for service which is not rendered to me. Reference of the Call: 479CTK050615