Hey ! I went through similar troubles, but I've found the solution. You can't go through PayPal's site to opt out, go back to your email where you were notified about the debit card opt out situation. Towards the bottom, there should be a blue block of white text that says: "If you do not want to receive this card, log in to PayPal to opt out by November 17, 2019, and we won't ship it." If you click on the "log in" link, it'll take you to a specific page that will let you opt out. I hope that's true for everyone!
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