I received an email addressed to me thanking me for purchasing bitcoin which I haven't with an attachment of a supposed invoice and direct debiting from my account that same day. Then saying if I disagreed I could phone this number. The person who answered said the number was PayPal security however email never mentioned PayPal. I suggest don't phone them as they could collect your phone number as a minimum.

I've just had exactly the same as above. Email came from messaging-service @ post.zero.com

Bitcoin scam, don't call the number. Just ignore the email.