You should know these figures are obviously wrong: a .com domain registration/renewal alone – without the redemption fee – is far more than this.
I don’t know how much Cloudflare’s “at cost” redemption fee is, but whatever amount they’re trying to charge your card is probably correct. (Other registrars charge as much as $250 for the redemption fee alone.)
Before escalating this, please confirm you have sufficient funds in the card for the $50 Cloudflare was trying to charge – and attempt the payment again. If necessary, inform your bank ahead of time to allow the charge.
If this fails again (after confirming sufficient funds and that your bank is not blocking the charge), update us here so we can have your ticket escalated.