Ok I am glad to see I'm not the only one. This person texted me and said "Heya xxxx." (xxxx being my name; trying to stay anonymous on this site). Anyway, I thought it must be personal because when you write "heya" and use the person's name, it seems it's someone you know, and I also don't have a very common name. Even though that was my name, I texted them back that they must have the wrong number, and never heard from them again.