Poor ADSL Line

<p>I recently umgraded my ADSL line from Telkom from 2Mbps to 4 Mbps. When i was still on a 2 Meg line, my test speed was aeveraging 1.6Mbps but billed for 2 Mbps. Now that i upgraded to 4 Mbps, my ADSL line is barely touching 3 Mbps, its running on 2.5 Mpbs but im being billed for 4 Mbps. I called Telkom Technical service yesterday and the lady who assisted me said she "optimised" my line, it was better and averaging 3.8 Mbps. Today it is back to 2.5, do i need to be calling Telkom everyday for the to give me the service that i requested and paying for? What is so hard about giving a consistent line that i am paying in full for? Right now i have to hold on the phone to close to an hour just to get assistance. MAY I PLEASE HAVE A CONSISTANT 4MBPS LINE THAT I AM PAYING R505 EVERY MONTH AND NOT 2.5 MBPS.</p>