Letter from dental insurance that we didn’t signed up for

Hi everyone. Someone in my family received a letter from MetLife about dental insurance. They never signed up for it. The letter shows it’s sent from “HIPAA Unit” and it basically welcomed you as a member and has some HIPAA stuff attached. There is no persons names or plan/member ID mentioned in the letter (besides on the shipping address), but it states the member can check everything online from online portal. A QR code is included in the letter. (Not going to scan it) with a seem legitimate customer service number. Have anyone else seen this before? They are pretty sure they didn’t sign up for it.