866-800-5475 has called numerous times..the last few calls I've received when home, I pick up the phone & immediately hang up. But I agree, it's very annoying. After a little "web research" I have found that National Union Fire Ins. Co. of Pittsburgh, Pa. is a division of the super-huge AIG insurance company. They are marketing auto, home, life, etc. insurance to individuals. If you want to complain to someone, I would go directly to AIG; write a letter to a "what's your problem" column in a major newspaper, or complain to the BBB and the "do not call" registry, being specific that it's a part of AIG!!!