Purported survey. Caller spoke barely intelligible but native English (Bangladesh?). Asked intrusive questions: about age, about income, etc. Would not accept "no" or "no comment" as a response. I cut the call short in protest. Since then, my caller ID shows three more calls from this number. This persistence led me to believe this was not a bona fide survey: I believe it was a mail-list or database builder for a telemarketer.