I sent this company a message to their email address more than a month ago, asking them politely not to call my number again. My email transmitted (no bounce back) so there's no doubt HSUS received it.
Subsequently I've gotten a call from HSUS at this number nearly every day.
I am not an attorney nor a tax expert, but I would suggest you do some quick research on HSUS, pay particular attention to what percentage of donations to this "non-profit" actually reach the cause.
Also do not confuse HSUS with The Humane Society that does do such great work with cats and dogs in need of homes.

Collection agency

hang up

Called for daughter-in-law, doesn't live with me, they "updated their records" and hung up on me.

It is the Humane Society of the United States. Just called the number back.