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If you will keep pestering them with an email about what you have done to correct your book (make up some stuff based on their guidelines) and send it over and over and over (waiting until they respond each time), changing it up a bit each time, you'll usually get through to an idiot that will unblock you.

That's great, sorry that Amazon is screwing you this way. I'll direct my students to your Gumroad listing then.

I'm not familiar with Gumroad; how do I find your book?

There’s a link on 8bitworkshop.com to both print and PDF versions have in the upper-right corner (GET BOOKS menu)