How to deal with an unethical editor?
I am highly suspicious that a big name in a field would make up a bunch of one line reviews for a submission. You should have definite proof and should think long and hard about how irrefutable your proof is before proceeding further. Bringing this up will reflect extremely poorly upon you  and your co-authors if you turn out to be wrong.

That being said, if you believe that you have proof of foul play, you should raise the issue with the editor-in-chief or whoever is higher up the totem pole. If you turn out to be correct, someone should inform the editor's school or place of employment about the academic misconduct.

If you'd like to take a more cautious path, you can email the editor-in-chief and ask if there was a reason all of your reviews were so short and if they had any suggestions for avoiding this in the future. You'll side-step the direct accusation while bringing the reviews to their attention.