WTF? Can't beleive this nonsense?

I dated my ex for five years till he moved out of town. We were engaged and our parents had made arrangements for us. within three months, he hooked up with a lady from that town, she immediately got pregnant, called me up to tell me that she's had a baby with my ex later on, didn't bother to ask her name or whereabouts as i told her, i had already moved on and was indeed getting married to someone else.my ex had stopped communicating with me and so i decided to move on. its been three years since our break-up and now am happily married. Out from the blues i recieved a voice mail from her stating that i cannot measure up to her, she bewitched my ex and if i am trying to get him, i will not succeed and blah blah... My goodness! i don't have any of their phone numbers, emails, contacts whatsoever. I don't even know which part of the town they live or work, i have no details of them whatsoever and haven't contacted either of them since 2007 (i think she retained my number from then). What is this rubbish and what do i do? I have never seen her, my ex for 3yrs, he rarely crosses my mind despite that we were a perfect couple that most people would either greatly admire us or be jelous. duh?