I think you are able to un-mark a post as a helpful answer, which will remove the "solved" flag. In practice the staff know that the solved indicator means nothing, but nobody will take offence if you remove a helpful answer status.
A Hub 4 might help if this is congestion on the downstream because of the better use it makes of available radio spectrum, if the problem is upstream then it won't because all recent VM hubs use a similar upstream configuration. Regarding the Puma chipset problems, they were fixed a couple of years back, and had no bearing on over-utilisation faults anyway. I'm afraid the last thing you need is the Hub 5, which is nowhere near ready for prime time. Scan the forums to see the posts relating to Hub 5 problems, Broadcom or not, that won't make any difference for you.
I'm afraid that if VM maintain there's no fault, then your only option is to leave, following my previous advice about complaint and escalation to CISAS if you're in a fixed term contract and VM are saying you'll have to pay an early exit fee. In that case, take screen prints of a good sample of BQM traces to show that there is a problem, and that VM's have failed to fix it when it has been drawn to their attention. You may need the screen shots as evidence if you submit a complaint to CISAS.
