"You" said you'd do something for me; and I'm happy to pay you to do it! In fact, I had to pay you before you gave me the results.
You didn't do it, or it was incomplete. I have to find an alternative.
The deadline was 2 weeks ago. I've been looking for an alternative since after the deadline because you delivered late. etc. I phoned the manufacturer of the equipment today and he is helping to solve my puzzle.
By the way a puzzle is when a piece is missing. A mystery is when you have way too much information and you can't find what you are looking for, or you don't know what to look for.