Called @ 1650. Silence for 30 seconds, then disconnect.

Same here... This number is almost identical (one digit off) to others I've blocked.  Clearly rob-caller scammers.

Called. Left no message so it can't be important.

Another scam. Don't answer because if you do they place you on a true active residence list which they sell to other telemarketers. Let call go as it is another way for a dishonest company to make money on you and then you'll get even more future calls from other scam operations.

hung up when they heard answering machine.

Blocked.