As far as I can tell, you were correct originally. From the Bookbub website:John D. Patten said:Ohhhhhhhh... smacking myself in the head here. I had a complete misconception of the four week rule. I equated a submission to a title. But if it's a different price point for the same title, it's a completely different submission. You just increased my chances substantially. Thank you!
Question: How soon can I resubmit if my book wasn't selected?
Answer: You can resubmit your book again four weeks after your original submission.
If you submitted your book for a discounted feature and are interested in resubmitting it for a free feature, you're welcome to resubmit right away. Our editors consider free deals separately from discounted deals, so there's no need to wait four weeks in this case.
Edit: I see now we are saying the same thing. Like Wayne said, you can change price to free and resubmit.