Rang back & call could not be completed or connected.
Sounds like a another scam
No message left by this caller

Rang & hung up when I answered

Called - I did not answer because I don't answer unknown numbers. I assume if it is important they will leave a message - no message so no call back.

Be careful of the scam whereby if you do call back and you are automatically placed on hold/in a queue, hang up immediately because you may have been placed in a queue for an overseas number, and will be charged the overseas telephone rate.

Call does not connect. Suspect spam