My experience with Bookzio spam

Background: I have been receiving emails from this company at an email address that I have NEVER used to sign up for any service. I have been receiving emails from this company for months, despite taking the following actions:

• reporting each email as spam with my email provider
• repeatedly unsubscribing from emails

The header information changes and I continue to receive emails from this company no matter how many times I report as spam, unsubscribe, or block them.