1) The other party's failure to fully comply with its discovery obligations does NOT absolve you of your obligation to comply with yours. The correct way to deal with this is to make a motion to the court to compel discovery and/or to sanction the other side for its failure; however, if you do not meet your obligations, they in turn could make such a motion against you.2) If you are representing yourself pro se, you may depose the other side. Obviously, you'll still need a court reporter to create an official record or transcript of the deposition.