Stuck in infinite registration loop

I tried to register for a new seller account. I then get a notice saying that registration has been rejected due to missing information.

Then I get an email saying “please respond with the necessary information, in order to proceed”.

I reply to that email and ask for clarity around what further details re required….only to be greeted by an automatic response stating “this mailbox does not accept incoming mails”.

So I’m stuck. And the Amazon Seller help team are useless, they just keep telling me “we can’t do anything, it’s a verifications issue..wait for their email”. Rinse and repeat.