This number  when it first came to me it stated it was from Nigeria. The number gives only 811- with the last number withheld. 234-567-811_
The said they were calling from Washington d.c. and they were a United States Federal Program awarding me $10,000 a month for life.  Obviously it is a scam. I got three calls within the hour. Their English was very poor.

Receiving calls all day long from different numbers such as 234-567-811.....034.....096...unavailable....032....850-491-8442...702-224-2006....203-544-4801   just to name a few....they do not leave a message

Unknown call from 1(234)567-811 (last number not shown). I did not answer since 1) I do not know the number and 2) it is obviously an incomplete number. I will block the number to avoid further calls