What I meant was set the Orbi to access point (sometimes called bridge) mode, and then have the hub as the router. Everything connects as you normally have it, and the Orbi provides the wifi, all the hub is doing is running the DHCP router. Not a preferred long term configuration, but stops VM blaming your equipment and means you can at least try and get them to fix a fault. My mesh system and hub are currently running in that configuration due to reliability problems, but even then there's no interest or ownership by VM in response to problems - the sole purpose of the customer service staff is to terminate a call as soon as they can and chalk it up as resolved (and the same for the equally disappointing complaints teams).
Your BQM shows spiking, but previous experience suggests that probably classifies as within tolerance for VM's low standards - trying to get it fixed may or may not solve the problem, but probably would carry you past the cooling off period, so if it doesn't work you'll be locked in. If you do revert, fingers crossed things improve.