Didn't answer. No message left. Blocked the number

Early evening call from this unknown number. Left a muffled and unintelligible one word message. Appears very dodgy.

Call centre only Hellos scam

stated was fraud call so number blocked

Didn’t know number, the did not leave message

My phone did come up with a ‘warning could be spoof’ while it was ringing which I have never seen before.

Phone came up with messsge that could potentially be scam

Didn’t leave message

Phone right next to me. Didn't ring. Received message saying I'd missed a call. Blocked.