That's frustrating. I'm on the 1.5G plan and get around 1.6G down and just over 1G up. I know that very few real-life files download or upload at the speed of test packets, if any. I also know that Bell's commitment is for "up to" the bandwidth speci...
Try disconnecting and then reconnecting the fiber connector. Make sure the tip of the connector is clean since even a tiny thread of lint can obstruct the signal.