Apple ID and dots in Gmail address

Gmail ignores dots in the address. Someone created an Apple ID with my gmail address, but with dots removed.

I got the initial emails, with codes for confirmation. I never sent these codes to anyone. The account still got created, and I get emails about this Apple ID and it's services.

I want to remove this Apple ID from using my email address without authorization. I don't understand how it's even possible to create the Apple ID without the confirmation codes sent to my email.

How can I proceed? I don't see a solution in normal support channels.