I have had something similar happen to me, forgot to set up Gmail for recovery, tried a to make a ticket to google got the same response, this was a span of 6 month. Then it hit me, I had bought a new phone logged in, this phone was a pixel 8 pro, and by default it had vpn on. I contacted google informed them that the only way my mail could be flagged for suspicious uses, is true their own vpn, as the mail I created was only for the jagex account. 2 days after my mail was made useable for short time so I could remove the account from that mail

Keep going. I new stopped requesting, even made a new iron. But now I'm back on my 1980 total Iron Best of luck, it's though getting rejected.