Dear _______________

Dear Boss,

Im not sure that you understand that other offices are closed this week and I cannot proceed with my work until I hear back from them.

I already told you that I've been leaving messages repeatedly since Monday and yet you wonder why no one has responded.

Yes, I will call again and leave another message. I'm sure that the person we are trying to reach is really in a 'conference' for the last three days as you had suggested or stepped out to use the bathroom ..... in the Bahamas.

Thanks,
Worker that wonders why she is working today.