I’ve had random texts on the past, in fact I used to get loads asking for songs to be played and answering competitions, my number was somewhat similar to some crappy commercial radio station that hadn’t got to grips with short text numbers, so I had a boilerplate answer template saying ‘Sorry, that service is not available. Please check your number and try again’ as I sometimes got two or three a day it gave me a certain satisfaction in pointing out they were stupid and incapable of writing down a phone number correctly. Stopped happening some years back, but I still get random texts from time to time, so I just send back ‘Sorry, I think you have the wrong number’, and almost alwYs get back ‘Ooops, sorry about that :0)’. That way nobody’s embarrassed or annoyed.