It looks like the 1 star review on Trustpilot worked.
I got a call from support and he asked for MAC addresses and Serial Numbers (ONT & Router). Asked me to try DHCP again, and amazing it not only connected, but I got my "static" IP back.
Back one the very first call I had with them about this, I asked if they were using MAC addresses for authentication, as how else would they know who I was, in order to give me my static IP.
So it looks like I've escaped with an internet connection. Terrible support though. I don't know why they can't just let you speak to their "seniors" in the first place.
Hey!Broadband 1Gb Fibre - Live BQM
Asus AC86U - Asuswrt Merlin