Hi ​@IgorK bcc – thank you for taking the time to share your experience, and I’m really sorry to hear you’re running into these issues.

The “Bad request. Deserialization error” typically points to a technical glitch—often from a malformed request in the backend. If you're seeing this while trying to delete a user or unsubscribe, something’s definitely not working as it should.

I understand how frustrating this must be. With that, I converted your post to a support ticket. They should be able to assist with both user management and billing-related issues. Again, I really appreciate your honest feedback!