Calls me 3x a day! Robo call to call them back "about a personal matter." I don't trust it. I have not ever given out my phone number to more than 10 people since it is exclusively for my staff to call me. They leave msgs and if i answer when it rings it has the exact same msg.
See if you're able to deny messages from this number or try blocking it. If they're able to leave messages, they're liable to keep calling. You may be able to get them tired of wasting time calling a number that only rings.