This is one of the rottenest companies i've ever ran across. They have called repeatedly dispite the fact we are on do not call list and they've been asked then told not to call this numbe again at least a dozen times. If anyone can figure a way to put this dipicable company out of business, pleae come forward and i'll be the 1st to help
This falls under the heading of charity which is exempt as a rule from the DNC. They can still get into trouble for not placing you on their internal DNC list though.
Your best bet is a call blocker, either device or phone.