Keep calling once a day. I don't answer. Have filed a complaint with the FTC as a nuisance call. I'm on the no-call list so I suspect they have falsely registered as a non-profit fund raiser to by-pass the telemarketing laws.
https://www.ftccomplaintassistant.gov/#&panel1-1
Repeated calls from this number but no message is left. Very frustrating especially as my number is registered with the Do Not Call Registry. Even that service is becoming somewhat of a joke for the number of calls that get through!
Los Angeles call. Recorded voice says she is "Katherine" (or some other name) with the "green ??? survey"??. She then asks if I can hear her ok. I then hung up, blocked the call and came on this website to encourage others to block this number too!