Who called from 3213255028

My husband got a text message from this number saying he's been sleeping with his wife for 2 years, that he didn't know she was married.

When he text back asking who this was, the number responded don't worry about it.

When we attempted to call it just rang busy.

I got this from the number "This is a automatic generated message from the united states department of health and human services: You have been identified as a potential sexual partner of a patient with a undisclosed SEXUALLY TRANSMITTED  DISEASES. Please come by you nearest healthcare provider for testing. Please do not reply to this."