I can't play RDR2 because it's linked to an email that no longer exists

So, my copy RDR2 on Steam is linked to my old Rockstar account which itself is linked to an email account that was deleted several months ago. I tried submitting a ticket about it but it was closed and marked as "resolved" after they said "If you have any further information we could use to investigate, or if there are any further questions, please let us know so that we can try to help."

And now whenever I go back to the support page to try and submit a request, the buttons do nothing but change the url to https://support.rockstargames.com/request/account without actually changing the page or letting me submit a ticket.