No message left, called number back from blocked line, automated voice says "thanks for calling, the survey you have been selected for has now ended". Blocked the number immediately.
Call rolled over to voicemail and caller left no message. I immediately called the number (415-349-7203) and got a recording saying "Thanks for calling. The survey you are calling about is completed." They did not identify who they are or what the "survey" was about. Likely a scammer.