Paying for a 10mbps internet but only have 2mbps

I signed a contract with Telkom for a 10mbps internet line speed and I'm paying R1500 a month for the package I got with Telkom but what makes me upset is paying for something but you cant use it. My internet speed for the last 2 weeks has been below 2mbps. I am lucky if I reach a download speed of 150kbps. Everytime I try to phone customer care on 10210 I have to hold on for over 30 minutes for someone to answer the phone which I don't have the patience to do. It's just frustrating that Telkom haven't noticed that my speed has dropped and did anything to fix it.