FINDING A NUMBER NOT IN THE CALL LOG

I have a Samsung Note 4 and this morning someone wanting to purchase my car called and left a message. They asked that I call them back, but did not leave their phone number. The phone log shows the voice mail number and not the caller's number.

Is the number stored on the phone somewhere? If it is, does anyone know how I can find it? The Telco said that they could not help.

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