3.1 Fees. You shall pay Cloudflare the applicable fees for the Registrar Services (“Registrar Fees”) prior to the registration or renewal of a domain. All payment obligations are non-cancellable and non-revocable, and all amounts paid are non-refundable
As much as this must suck, this is a mistake on your part… and the burden is yours to carry. You have to make a second purchase for the correct domain, as domains cannot be edited.