Telkom does not live up to their "deals"

I got the 4meg uncapped deal from Telkom but have had endless issues with the speed and connectivity. The line is advertised as a 4meg speed but when I do a speed test I rarely get 4 it's always between 2 and 3 mega. We have alot of down time aswell and when i phoned Telkom and reported a fault i was told that if they came out and couldn't find a fault i would be charged so for now they will "port the router" if I'm not mistaken. That didn't work so phoned back and told them are they not able to see on the system how many times I've had to restart the modem to try get it working properly? Which he said he can see... so obviously there is a problem but if Telkom comes out and cant the problem I will get charged? This is the only business that charges for a service they dont live up to I usually have half the speed and lots of interruptions but I'm being billed R605 a month if im not mistaken