Calls at least twice a day and doesn't leave a message. When I try calling back all I get is hang ups and busy tones.

You're bs too.  I've learned nothing more by coming to this page.... just an annoyance.

This phone number, as of this date is being placed from Lambeth, Ontario.  Lambeth is part of the city of London.  Maybe worth a drive out there... I'm sure getting the address would not be too difficult. There are several sites, for a fee, that would supply it for you.

I have had similar calls from (519) 652-1538, so has my dad.
My dad has a Life Alert call system and they will tie the phone line up at all times of the day and evenings. If he has a heart attack the system will not be able to call out this could be life threatening