How do I get VM fibre with so many hurdles?

We only have a BT/Openreach copper wire connection which breaks down constantly. No plans for at least a year to put in BT/Openreach fibre. VM is my only option but I can’t sign up online to change provider because my address isn’t on the VM drop down menu/database. As a result I’m invited to fill in a form to express my interest. I’ve done this twice now with no response from VM. I’ve tried the chat which seemed to be getting somewhere when I got a real person to message with. They told me VM fibre wasn’t available at my address and sent a link to a form which crashes the chat (I’ve got that far a few times) so I’ve not been able to even see the firm and have to start all over again. My next door neighbour has VM full fibre into their property and the connection is a few feet away from my building. I’ve checked all the other adjacent properties by starting the VM fibre sign up process online and I’m told VM fibre is available to them. So how the heck do I get to have a sensible conversation to unpick this (admittedly complex) situation with someone at VM who can help move this forwards? I’m trying so hard to become a customer! Any helpful suggestions would be greatly appreciated.