This is a scam. The caller is NOT Apple or Walmart. Repeat: This is a scam. Do not respond in any way. Simply delete the message. At least some of these messages are directing people to a malicious site. Do not let curiosity get the best of you.
Please do not post working links to scam web sites. You can break the links like this: www.google (dot) com so that no one accidentally winds up on a malicious site.