I'd say it's time to get a call blocking device/telephone. There are many of them out there starting around $40 or so and available at many places locally and online.
you did the right thing. this is a total bogus vet support group all they are after is your money all of it it lines these creeps pockets only IT DOES NOT GO TO VETS again a totally phony fund raiser for so called Vets DO NOT FALL FOR THIS PLEASE ANYONE !!!!!!!!!!!!!!!!!!!!!!!!