Unfortunately due to a lack of customer support posting here gives me the best chance of getting it fixed!
If google had working support flows I would not have written this up or posted here about it.
A few years back I lost access to a different google account as the recovery phone number was a landline and google was trying to send SMS messsages to it. I had the right password but it thought I was suspicious and insisted on SMS verification.
I never managed to reach a human to get something done about the issue.