Check the conf settings on the Hub. It will show what speed has been provisioned.
It's Configuration tab - Primary Downstream Service Flow - Max Traffic Rate.
Try a 60 second factory pinhole reset as below;
Remove any ethernet cables from the Hub and hold the pinhole reset switch for 60 seconds. Do NOT reboot the Hub, just let it do it's thing. Note you will need the passwords from the bottom of the Hub afterwards, so make sure they are legible.
Post the power levels, Pre and PostRS errors and network log from the Hub. Also setup a BQM to monitor your circuit www.thinkbroadband.com/ping Once done we can comment.
If using a Windows based machine, try a direct cabled speed test using "Safe Mode with Networking Support" option in Windows.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks