"I have checked with our system and it doesn't look like you are currently subscribed, nor have ever been subscribed, to our email list.
We have been having an issue with other people sending spam emails which pretend to be from us but actually are not, an issue we are currently looking into.
It sounds like this may be what you have received. I recommend marking those emails as 'Spam' and blocking those email addresses via your email client.
Hope that helps,"