Re: Can't get help with broadband because I'm not the account holder!
I've checked your connection from here and yes, your Hub is only locking on to a single upstream channel instead of the 4 in the assigned bonding group. Plus you should ideally have a newer Hub model for your subscribed tier of service. I have ordered a replacement to be sent out to you (Hub 3), here are the details:
The new Hub should arrive within the next few days.
The courier, Yodel, will leave contact details should re-delivery arrangements be needed.
A text will be sent (to the mobile number we have listed for you) the day prior to delivery advising of an ETA.
Full setup and activation instructions will be included.
Keep us updated on how you get on. If there are any further issues I'll re-test in case an engineer visit is required.