I had some guy texting me at all hours of the morning, I'd be sleeping at 2 am and he would text me. It happened every few nights over a couple of weeks, finally I sent him a reply that said "who are you and how do I know you?" so he called me!!!! "girl, you know me, don't play" "NO I have NO idea who you are or how you got my number" "girl, you gave it to me at the club, stop playing" "I haven't been to a club in at least 6 months, WHO ARE YOU?" "girl, stop, you hard to get I get more determined, what you doing tonight, where you working?" "I'm not working, I'm on vacation, with my BOYFRIEND, would you care to talk to him?" click.....I thought that would end it, but that very evening I got another text, I had turned my phone off tho because I didn't trust him so I got it in the morning. The text was "girl, where you working tonight, you working now?" It was 4 am when I got it. I replied "Look dumbxxx you don't know me, stop texting me, do not call me, if you bother me again I will go to the police" his reply "sheesh, sorry, don't get all rude about it"...I'd already told him I didn't know him, what else was I supposed to do? LOL Yes, the police threat was a bit much but still......I use my phone as an alarm clock, I do not want a random text at 2 am when I have to get up for work at 6:30.....it worked, he stopped....LOL
Have you tried to call the number back?