Someone calls you on the phone, but you don't know who they are. The conversation goes like:
Caller: "GIBBERISH... GIBBERISH... GIBBERISH..."
You: "Um.. Who am I speaking with, please?"
Caller: "It's ThisGuyWhoseVoiceYouShouldHaveRecognized..."
Should your response be:
"Oh, hi! Sorry, I didn't recognize YOU."
"Oh, hi! Sorry I didn't recognize YOUR VOICE."
Could the former be used in a phone conversation at all?
Does it not sound like that you don't recognize them/they're importance/their existence?
Please also let me know if you'd go with an alternative phrase to begin with, and if you could give two examples, one polite/formal and one for casual situations.