representing American Kidney Association - I believe it's scam.

There is a National Kidney Foundation Inc.  https://www.sos.wa.gov/charities/search_detail.aspx?charity_id=8866 using fundraisers Donor Care Center Inc https://www.sos.wa.gov/charities/search_detail_cfr.aspx?cfr_id=24607 and Automotive Recovery Services, Inc. https://www.sos.wa.gov/charities/search_detail_cfr.aspx?cfr_id=29123 they do have an Atlanta Georgia location 270 Peachtree St NE #1040, Atlanta, GA 30303 Phone:(770) 452-1539
It's impossible to tell the difference between a scam charity or their corrupt, unprofessional, and unethical fundraiser brothers/sisters charities or their personnel working call centers disguised under like or similar names, failure to disclose the exact name of charity and fundraiser.

calls every day and never leaves a message... STOP Calling

Calls everyday leaves no msg.