Hello @NeilR97. I'd like to take a closer look at the email that you received. Would you mind sending a screenshot of the entire email, including the header and the From email address to social_support(at)constantcontact(dot)com? Thank you!
Thank you for bringing this to our attention.
Any official Constant Contact email regarding billing with come from an (at)constantcontact(dot)com domain. I would recommend you call into our Support team so they can direct your to our Compliance team. Support's contact information can be found here.