Only two days to go before the issue is permanently fixed, that's great! So everything below is hypothetical.
I'm sure that's an honest date backed by a program of action to increase network capacity. If you're less confident, I'd suggest you start organising the neighbours, and seeing how keen they are to actually do anything. Whilst you act as Wat Tyler, I'm sure they're happy to moan, agree but not do much (and of course, things didn't work out so well for Mr Tyler). VM's historic handling of over-utilisation problems has not been good, and with the pressure of lockdown and school closures the problem is worse. Obviously, if the sun rises on Saturday morning and the problem is fixed, then you will be sooo happy.
But if Saturday comes and it turns out that VM have over-promised and under-delivered you need to think about other approaches. You could individually all raise formal complaints with VM, and if/when those get fobbed off, each is individually escalated to the industry arbitration scheme CISAS. That would be expensive for VM as they pay the costs of CISAS (which are not cheap), but whether your neighbours can really be bothered with that only you would be able to find out.
If you've got a good density of prospective customers, then contact a decent ISP (I'd start with Zen Internet, but Aquiss, uno, IDNet may be worth a call), and ask if they can offer a bundled Openreach "Fibre on Demand" price for the street - actually, do it in writing and copy in VM's CEO. Embarrassing the bureaucrats of this world can be a considerable stimulus, although if that doesn't work and nothing comes from VM because the CEO happens to have his hands stuck in the hair gel pot again, and you get a priced offer from another ISP you will certainly find that suddenly your neighbours start mumbling that they don't want to pay a couple of hundred quid contribution, or they're in a nicely discounted fixed term contract with heavy exit penalties, or they don't want to lose the email address they've had for two centuries, or they'll do it next week, or they can't sign a new 12 month contract etc etc. Things may be different if there's an alternative high speed broadband provider who might cable your street (such as toob in Southampton, Cityfibre in a range of places), although even this won't be quick. The best route to find out what companies might be available would usually be the metropolitan or county council.
You can of course all write individually to your MP, lamenting the lack of telecoms consumer protection due to the persistently slow, weak and ineffective regulator Ofcom, the poor service from VM, and the absence of any meaningful recourse. Or the local paper (although with both politicians and journalists you'd need to explain the detail of the problem in words of one syllable, and start off with a summary paragraph for those "hard-of-attention").
I'm guessing none of those options seem attractive. What people want is a good internet service at fair monthly price that they can join when they want to, without having to write multiple letters or lay out much of a setup charge. Unfortunately, I can't see that is on the table for your street in the immediate future unless VM really pull a rabbit out of the hat in response to suitable pressure and embarrassment.
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