I got this email from them too a few months ago. It turned out I was advertising on traffic exchanges which apparently is not ok.
They were a little sketchy as to what they will allow and won't, but I am assuming that banner and text link exchanges are ok.
Drop them a line and ask them, just explain your not sure why they have contacted you and could they give you some indication as to why they think you've been logging invalid clicks or impressions. At least you will then know and not make the same mistake in the future.
Good luck!
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