If I get call from a number that I don't recognize I send text that I cannot talk right now. Look up the number then block the caller. Never have to hear from them again.
Just got the call on my cell. They left no message so I called back from my work number. The automated message says "Thanks for calling, the survey you were called for has now finished. If you would like to be removed from our list for future calls please press 9" **No company name given.