I am guessing its a scam, because the company name listed for that number is nuvox communications which is a VoIP company! And if you call the number you can't reach a person just a voice system
My wife and I also got text alerts that claim to be from 865-456-2987, the alert says "BANK ACCOUNT ALERT: Your CARD has been DEACTIVATED. Please call 865-934-6037." The funny thing is, my financial instution (which is NOT a "bank") does not have my cell phone number.