You must do this before due date? vs You must do this before the due date?

[Terence23]

Which one is right?

You must do this before due date? or
you must do this before the due date?

[Ralf]

Hi Terence,

What's the context here? Both options don't necessarily sound wrong, but to me 'it needs to be done before the due date' sounds more like the ticket.
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[Terence23]

Thanks very much Ralf, I really appreciate it.

I've another question which I came across recently. I read

".... On 22 May 2008, Mr David from ABC News, HR Department called on the matter and confirmed that ....."

My question is 'Shouldn't there be a comma after HR Department?'

[Torsten]

I think the comma after HR Department is optional.

TOEIC listening, question-response: What's your phone number, please?