Several months ago, I sent a document to two people in another department within the same organisation (via email), asking for their thoughts / feedback on its contents. I did this because it was directly relevant to how our two teams interact and collaborate - and I wanted them to be consulted (we don't share any reporting structure other than the CEO). The context is around the roles and responsibilities within our respective teams - including what we do and how we add value to the organisation.
I never got any response or acknowledgement from either recipient, so I assumed it wasn't something they were immediately concerned about or interested in. However, I've now discovered a very large portion of that document has been duplicated, in a new process document they've created in the last few days - that has now been shared with the rest of the organisation as their own work.
However, the new document happens to be critical of my department (with the overall theme being "we don't need them, look at the great things we do" - using my work as examples of what they do), so my issue goes beyond the plagiarism aspect - which I'd have been happy with if the document had been put to positive use.
My work accounts for around 25% of their document - they've obviously done some minor editing, but it's very clearly my words as whole sentences and several paragraphs remain entirely unaltered. Now, as we all work for the same organisation, I'd imagine the company owns all the content regardless, so its not a copyright or ownership issue. In any case, is it reasonable for me to expect my contribution to at least be acknowledged (really I would have expected them to ask for permission, at least out of courtesy)?
The main aspect I find inappropriate is them using my (unattributed) work to be critical of the role my department plays within the organisation. This seems deliberately underhanded, as they never responded to my request for feedback. At the time, I wondered if this was because they never read it or forgot about it - but now it's obvious that was not the case. How can I professionally highlight their plagiarism, distortion and misrepresentation of my work?