robzilla - 3:53 pm on Aug 23, 2013 (gmt 0)
Assuming no threats have been made, I would probably try to ignore this. Don't fuel the ire by responding.
Perhaps a good time to research yourself, and see what's out there. A date of birth can come from many places; a genealogy tree, perhaps?
It's annoying, certainly, but it seems fairly harmless the way you describe it. Keep records and discuss this with the police if he kicks it up another notch.
He's mostly ruining his own business as word gets out.