I have just received the same thing with the only exception that the number was 9171757544.  I spoke to the CS rep and they said, especially with the event of my finding this entry on your behalf it is a phishing/spam issue.  My account is not locked and it is "in good shape" as the representative told me on the phone.

Thank you for your post.

P.S. they did have me forward the message to 7726. They then responded asking the sender information.  I was walked through the procedure with the representative who instructed me to put the number in ( ) and then UnverifiedSender in the text line.  It is a way to report spam and fishing.