one of our web sites is under attack now.
We tried to add this domain to Cloudflare but it says that this zone (domain) is banned. Support article says:
When Cloudflare observes too many attempts to add a domain to Cloudflare, an error is returned:
Error with Cloudflare request:  This zone is temporarily banned and cannot be added to Cloudflare at this time, please contact Cloudflare Support.
So we suppose that the hackers have tried to add our domain multiple times to Cloudflare to make it ban it.
How to handle this? Is it an issue of Cloudflare?