Billing emails from CloudFlare even after account deletion ticket number is 01488228.

I deleted my CloudFlare account before this, but I still have a community account and an email from CloudFlare billing me. (The billing amount is 0, so it's ok.) It's weird and I want to contact them, but my account has been deleted and I can't create a support ticket. What should I do?
I have posted about this in the community.
https://community.cloudflare.com/t/billing-emails-from-cloudflare-even-after-account-deletion/792874
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