unknown caller...so annoying

I just got a call...answered and no response

Has repeatedly called, no answer, no voice mail left.

Caller ID said Potential Fraud. I didn't answer and they didn't leave a message.

Guess I'm the 5th call made from that mystery number.  Don't know anyone from that exchange, they left no message, I'm inclined to think it may be related to some type of scam.  Wonder if our 5 #s might be sequential, which would show it to be an automated call, which is usually the tip off that it is a questionable caller and we're better off to have missed it