Also received the same text - I think it may be related to the security breach at AmeriCU. It appears they were hacked and someone got names and phone numbers, but not card numbers (or they wouldn't need to try and get people to call them).
Some more (but not enough) information is available at:
I called the number and a recorded voice asked me to key in my card number. Like hell. If my card was compromised, my credit union would contact me directly. Scam