The polite thing to do after texting a wrong number is to apologize, maybe take a quick screenshot of your brief exchange, and get on with your life. This person took a completely different route—the route of denial—and decided to blame the recipient for the wrong number text.
Rachyl isn’t here, Rachyl has never been here, you have the wrong number. This didn’t dissuade the texter from believing that Rachyl wasn’t really there. In fact, they asked the responder to confirm their number, which wouldn’t solve any problem at all. Nobody but your own brain is trying to trick you, texter.