I recently got this email and thought this really came from BT, but when I clicked the link provided, my computer warned me that this has been reported as a an email hoax. So I went to the BT website to check this out and found a way to confirm if this really came from them.
I did that procedure and found out that the email address is not from BT, so I have reported this to BT! Also, I have checked my BT account and found out that my recent payment was successful and recorded. So if you got this BT Alert email, do not click the link!