Facing a seven day broadband outage

Does anyone has any suggestions about this situation.
I'm facing a seven day outage of my home broadband, and that seems appalling service to me.

Virgin Media broadband, GU16 postcode, Superhub5.
Friday morning it was working fine.
Friday lunchtime Virgin texts to say there is an outage in the area.
Saturday 8am Virgin texts to say it's fixed. But it's not, and their service status page gives a repair time on 1pm for the outage.
Saturday 1pm the service status page says it's fixed, but I still have no service.
(Flashing blue light on the router, I can check the router status via Wifi, the router seems to be working, but it reports zero DocSis channels.)
I have tried power-cycling the router (many times).
I have done a factory reset on the router - no change.
I call Virgin, they say they can't contact the router remotely, an engineer needs to come out, and the earliest date they can give me is Thursday.
So that will be a SEVEN DAY outage for something that all started as a Virgin area outage.

Strangely, Monday 8am there is a solid blue light on the router.
I connected via Wifi and answered prompts about setting the SSID and password.
But when it restarted after that, it went back to flashing blue light and no service.

Amusingly, I'm out of contract in two months and the Virgin agent tried to sell me a renewal at a higher price while we were waiting for the router to reboot. I said I wouldn't renew a service that wasn't working.

Even more amusingly, they've just emailed me to say they are changing my phone over to fibre optic, so I wouldn't even have had a landline for seven days.

Is there anything else I can do locally to find and fix the fault?
Is there any way to get this given a higher priority at Virgin, as seven days seems a completely unreasonable amount of time?

There is no mobile data signal at my house, so this is really causing a problem.

Thanks in advance for any suggestions.