Calls at least every other day.

Caller ID showed: FIRE CHARITFUND  Was not answered. No contributions to unknown charities over my near obsolete landline phone system. Arghhh....

Must be a new scammer. Only one complaint besides mine. Called, I didn't answer, no message left. Had to be someone who knows I don't want to hear from them.

We have two phone lines in our house.  This number called almost simultaneously to both phone numbers twice today.  FIRE CHARITFUND.  If this is it, it's not a good charity:

Firefighters Charitable Foundation was created to provide financial assistance to people who have been affected by a fire or disaster.
Over the past decade, its professional solicitors have been the biggest beneficiaries. From 2002 to 2011, it raised $64 million in donations and paid $55 million of that to its solicitors. The charity spent less than 10 cents of every dollar raised on direct financial assistance to those in need.

charitywatch.org gives them an F rating. charitynavigator.org gives them 28.49 out of 100, which is zero stars out of four. Firefighters Charitable Foundation sucks. If you want to pay for some amoral cretin's Mercedes, this is one way to do it. An outrageous fraud in my view.