If your Twitter account used your real name or business name be very, very careful and re-think deleting it entirely. A dormant account may add to their numbers but someone grabbing your name could do some real damage. https://mstdn.social/@Remittancegirl/113447801826461051
@chris Best move is to delete all content, squat on the username.
If you have a website, note in your contact that you are not on Twitter or only username squatting so its not ambiguous.
Perhaps there could be more done, like hijacking the page with a referrer, if attributed to Twitter, with a modal or a warning saying that you don't have a twitter account and if any account is using your name, they're trying to scam you.