This reminds me of an incident back in the 1990's IIRC. I had arranged our 3 main sites to have Megastream2 links in a triangle and BT sales assured me that the links were diverse. But a fire in a tunnel between Manchester and Salford was upstream of our links and they failed. We were OOS for about a week, again IIRC.
Not just us, either! Lots of businesses including banks were offline. So no cash machines, card payments..... (cue public unrest).
The situation was so serious they drafted in plods from other areas to reassure the public. I had to issue them with local guide maps (thanks to the Tourism centre) so they didn't come across as gormless when interacting with the tourists and other plebs.
Lesson learned: If your provider says the links they serve are diverse:
* Don't believe a word they say!
* Insist on them providing guarantees with significant penalties for failure!
* BT/Openreach sales lie!
aka Bernard