Oh Morpheus how awful!
Since I'm not in S.A., I don't know the employment laws that might apply. But from an investigation point of view, I'd approach it like this:
Pull together EVERYTHING -- all of your notes, all of the meeting informaiton, everything you inherited and have done. Then...
1. Create a timeline. Dates you received the project, dates you had meetings, dates you had phonecalls, etc
2. Show the data you received when you inherited the project.
3. Explain the direction you were given at that time (was it just "finish this" or was it "this need a, b, c, d and then a project report" - I suspect it was the first)
4. Give an honest assessment of each step of the process - don't try to say "It was Mr. Roberts who made me get off track" Instead "Mr. Roberts said 'do this' on such and such date, and I followed his direction."
Don't despair - if you pull through this you could establish strong credibility as someone who can pull a project out of the depths and be an even more essential part of your organization.
Oh - one more tip - BREATHE. That's it, I expect you've been holding your breath for the lasty minute or so. So BREATHE again. Two or three deep, calming breaths can help the worst panic, and help you deal with it calmly and rationally.
One last thing - I'm sending cyber-hugs of support to help you through this as well!
~"I find hope in the darkest of days, and focus in the brightest. I do not judge the universe." (Dalai Lama)