Why did he think it was me ...

I can't help but wondering why he thought it was me who had left a partial voicemail message for him on Friday morning.

Yes, the voice does sound like mine (he played the message to me), however:
* Why would his first thought be that it was me, instead of the client he had left a message for earlier in the week? Why aren't I the last person on his mind that would be leaving a voicemail message?
* Thinking that it was me, why did he reply? I thought that him being in contact with me 'caused problems' (from what he said when I sent the One Ping Only, and what he said on Sunday), so why contact me?
* The few words that were said were along the lines of "(his name) I'm just about to drop..." (then the message stops/is cut off), not the kind of message I would leave I don't think, not the kind of message I have left him since we parted .. it's not as if I drop by, or drop something off, or tell him I'm dropping out to the shops, or anything like that, none of our snail mail has been about that kind of thing either ... so again, why would he have thought it was me? Just because of the sound of the voice ... it makes me wonder what that says about where his mind/thoughts are.

I don't know, there's only one person who does.