normally bank will not sms or email u. they will straight call u directly. But still it is better u call the bank directly or email to their customer service. i presume that bank closed on sunday, thats why u can't call them?
what did the sms say besides that? did it ask u to call their number or what?dont call any of the number in the sms. call directly to ur bank telephone number perhaps on monday morning. careful with fraud ya.

ohh. my bad. haha. but since it ask u to call the number behind ur credit card, it should be legit. Autobill eh, perhaps u have sign up some purchases recently? Check with them the purchase details.