When you say "pretending to be me" do you mean that they spoofed your email address in the from and/or reply-to fields?
[edit: typo]
[edit: typo]
From: YOUR_NAME <team@angel.co>
Reply-To: YOUR_NAME <YOUR_EMAIL@gmail.com>I had a similar experience with F6S sending emails in my name so I know how uncomfortable it feels.
This is a shame and hopefully just a one-off error.