I have limited experience with pushers, but my limited experience tells me that they like to go side to side at the base line. That is their comfort zone. So why give them what they want?
Drop shot/Lob. Bring them in to the net even when your instincts tell you not too. Get them going forward and backwards, not side to side.
Anything short, be aggressive yourself and come into the net (even if that isn't your comfort zone either). Change the "look" of the match.