they called us today too--same number--i didnt pick up the vmail was about 10 seconds of silence. i wont call it back just in case its a marketing thing-to see if they can get a live person back on the line.
guess it'll remain a mystery
if i don't recognise a number, i don't answer it...and this was no different...though i should cos it's them having to pay the bill, not me. muahahahahaha ;-)