Please tell me this isn't happening.....and over a phone bill? "Formal" training isn't the issue here, although I hope it's used as a defence, but more the trust that is put in the FSI holders. As BEagle alluded to, if this is the way of things to come, then individual claims must be the only way forward. The hotel room only can be paid by one individual, on an approved card. Everything else - calls to ATFOC, handlers, caterers etc - will have to be justified by the individual making the claim on return to home station.
I know nothing of this case, but as a former FSI holder, I hope that justice will be done. And when I come back, I will never again sign the Aircraft Captain's declaration on the Imprest paperwork.