Not achieving minimum WiFi speed

[JRT]

Hi, I am unable to attain the minimum speed that was paid for which is 400 to 500 mbps, but only achieving 100 Mbps. I've tried to turn it off and on, and have given it time to recalibrate but to no avail.

[TimmyBGood]

@JRT 

Those are minimum broadband speeds (cabled to the router from the internet) and not WiFi speed (wireless from the router to local client devices)

All WiFi is zero Mbs after some tens of metres or on the other side of a few walls.