Thanks for expanding on your situation. As I said before it is difficult to advise and make judgement without knowing all the details.
I think it's strange that if the directors knew you were transferring the placements and thought you were being generous, how they can now be investigating.
Write down as accurately as you can, your recollection of course of events - what happened, when, who you spoke to and who was present. This will enable you to put forward your best case.
Good luck