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What stage of the lawsuit are you at? For example, have you had discovery?
If they don't provide their Affidavit of Documents then your next step would be to bring an application to court to get an order compelling them to provide theirs.
Then what did you give them a deadline for? What costs are you asking about claiming?
So then you move on to the next stage and you make arrangements with them to set up a time for discoveries.
This is not for your witnesses.
It is where the parties get to cross-examine each other about the pleadings and the documents.