ULPT Request: Looking for a way to sign someone’s phone number and email up for spam, a LOT of spam

Wife of 18 years cheated on me and left me for one of my “friends.” Pretty sure this isn’t illegal, but it will get frustrating as fuck as I play the long game and do it over and over. My goal is to make them have to switch numbers/emails which is a PITA and then do it all over again.