Not supplying what they are being paid for!

I have upgraded my Telkom 2MB line to a 4MB line with telkom (and yes I do have the data package too) and since my application on the 6th of Feb (last month) I have yet to see an increase in speed from my previous package. I am being billed for a 4MB line package @ R750 yet I'm only getting 2MB line speeds. Telkom, I am very disappointed in your service. I have logged faults and had your technicians out here telling me I will receive an sms saying that my service is restored and that I should ignore that message and be assured that they are working on the problem. I was told by them that they would have to replace VSAT cables from the exchange. It has been a few weeks and have had absolutely no updates RE my issue and no improvement on my service. How can you bill me for a service that I am not even getting??? I expect that you credit my account as I am paying for a service I'm not getting or that you fix my issue ASAP.<br> <br> Regards<br> Rudi