Issues with cabinet/beyond engineer support

I am having major issues with my virgin media internet. I had I think my 6th engineer visit this Saturday just gone (11th October) since march ISH time.

I have had multiple hub replacements, isolator replacements, attenuator changes, in and out of modem mode with multiple routers tried when in modem mode. They've also moved me in the ports on the cabinet twice. It doesn't matter what I do or the engineers do, it just keeps disconnecting.

The engineer that visited this Saturday did something different though. He actually bothered to check other residents in my buildings connection to see if they also get drops at the same time. And surprise surprise, they do. He then called another engineer to get a number for "networks" which I assume manages the cabinet and beyond, the stuff he can't fix. He put his colleague on speaker as he explained the situation and his colleague on the phone said it was a KNOWN ISSUE. So I've been going through this all year and virgin media are fully aware it's a networks issue not my equipment and have done nothing.

The engineer said he would escalate to the networks team and his boss and call me before the end of the day to let me know if networks were going to take the case or not and actually finally fix the building. But he didn't call me...

What am I supposed to do? I pay £70 a month for internet and it doesn't work. And I've just found out from the source that they know it doesn't work and are doing nothing about it. This quite frankly is outrageous. What am I paying for? How do I escalate to networks myself? I'm at a loss of what to do.