Fibre optic not fast enough?

well you see, just before i got my fibre optic, i was jumping with joy, thinking about the lagless online matches i would experience but when i got fibre optic, i realise its not the case... my fibre optic (said to be) speed is 100mbps download and 50mbps upload... but when i run a speed test, i only got 10 mbps down and 12 mbps up... this really hurts me.. i want to play black ops running on full bar but all i got was 3 bars...could someone pls tell me whats wrong with my fibre optic.. i thought that i would have a optimal gaming experience... NOTE: i am using a aztech wireless home plug extender as my modem is on the first floor and my mac and ps3 is on the 3rd floor