Use your phone as a hotspot until the internet is resolved.
Use the post directly up from yours to get in touch with NOW for an update.
When I tried calling them last night I found the support line is shutting at 8pm, not 11pm. They're doing the "linked to Covid" thing.
Frustrating as this is - as I thought support was available continuously - it didn't make any difference for me;
My internet broke at around 8:20pm last night and, after trying the usual checks/reboots, I called support after 10pm - so they had already gone home by the time it broke.
Also, as I understand from what I've read here, it's a BT Openreach fault so the helpline staff have no power to do anything about it and are probably just as in the dark as us waiting for updates from BT.
It sucks to lose the internet - it really should be more resilient.
...and yes, I did manage to set up my mobile as a hotspot - but I have an unlimited data plan so no surprise costs there. However, it gives me 6 Mb/s instead of the usual 30 and I haven't worked out how to link to my desktop computer and, as I haven't played online in the last few days, steam won't verify me and I'm locked out.