CallerID numbers can be spoofed https://en.wikipedia.org/wiki/Caller_ID_spoofing so if this number calls you, do NOT give out any info. Ask for a call-back number and check the number out before you call back -- this way, you have a chance to check it out and know for sure who you're calling. If you cannot find any info on the call-back number they give you, then do NOT call back.
This just happened to me as well. They call, I answer, they hang up. I call back and get the recording that I reached a non working number... hrm... fishy fishy fishy.