Wow, cue the "Twilight Zone" music, Lexie...yes, maybe some sage for exorcism, plus tossing a little salt over your shoulder!
Probably the weirdest phone thing I ever had happen was when I actually DID hear a dead person's voice on the phone! My BIL had called me and I returned the call. I didn't get him on his cell and thought I would try his landline since whatever it was was something of some urgency. I looked up the number, dialed, and almost fainted to hear the voice of my sister, dead some years before that of breast cancer, on the answering machine recording! Holy carpfish, that threw me for DAYS! I'm sure he kept it for some kind of comfort or remembrance, but I was NOT prepared for that, not in the least.