I just got the same thing, it seems like some kind of mass phishing scam text. I guess it's worth it to the criminals if they can find just one idiot that buys into it, but it sure is annoying.
I called the number from a landline just to test.
Robo-response: "Hello. Thank you for calling SunTrust Bank. We regret to inform you that your debit card has been locked. To reactivate your card please press 1 now. To leave, please press 2".
Definitely some sort of SCAM. I have never used SunTrust Bank.