ADSL line syncing at half the speed it should...

My 8mbps ADSL line has been syncing at 4.4mbps for weeks now, I picked this up when I started using Netflix and content wasn't loading at the required speed to enjoy seamless streaming. I called my ISP, WebAfrica who logged a call with Telkom as the fault lies on the Telkom exchange side. This was more than 2 weeks ago and as yet, 2 Telkom technicians later, nothing has been resolved. I have received two calls from Telkom to ascertain whether the fault has been resolved, which it has not. Please can someone resolve this asap. I'm tired of paying money for a service I'm not receiving. It's time our service providers get with it and start providing the service we're PAYING them for.