June 21, 20121/2 dozen calls in past 2 days...line dea when you answer and if you call the number - it doesn't "compute"...weird

this number calls me once a month excatly every 3rd saturday of the month and always around 6pm
I dont bother to pick up

When it calls me the line is dead and no one is there. When I call back it says the number you have called is not assigned. What???

Just received 2 calls from this number today and on the 2nd call there was a message saying there were calling from Mazda. Wanting to remind me of my next service?

Who keep calling me without any answer?

This # is filling up my mail box with silence