In case this is handy for anyone else who has to deal with this scenario dailypic.twitter.com/lJQzgU6ZP5
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Vice are particularly bad for this. Your expertise took time to develop and nurture, it has a value. You deserve payment and credit for it.
endless problem from media and academia. See also 'can you read over this bid?' with promise you *might* be paid/included if gets funded
As a grad student I sent researchers papers & even a chapter of my book, when I should have directed them to publisher's site 
Unsurprisingly, was never credited or asked to contribute. Lessons learnt!
I've been told 3 times by TV prod co's that they can adapt my non-fiction/historical work w/out pay or credit as I 'don't own the facts'
Oh for pete's sake.
I'm conscious of this now in terms of getting quotes for articles. Didn't occur so much pre freelance days as mag editor.
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