I've had contact with customer service before to verify things like mismatched shipping/billing info or issues with payment methods, so doesn't sound out of the ordinary. If the authenticity of the email is questionable to you, you could reach out first from via the email address or live chat or phone number accessible from the "Customer Help > Contact Us" menu at the top of the page as opposed to clicking any email links or anything. However, this sounds totally normal to me.

Yeah, I've had Buds call me but not email me to contact them. To verify, just give Buds Customer Service a call at 1-859-368-0371 9am-7pm EST Mon-Fri and ask them if it's legit.