First, if no action is being taken against you (e.g. they are trying to evict you), there's no need to do anything. And, if no action is being taken against you, they have no obligation to present any evidence or witnesses to you.Second, if they are trying to evict you, then they have to prove their case in a trial (assuming you do not agree to move out)--eviction *must* be done by a court proceeding. If that is the case, they will have to present evidence--such as testimony by witnesses--that you are doing what they claim you are; that will be your chance to confront witnesses and present your own evidence.Note also that merely running a business out of a residential apartment does not automatically mean you could be evicted, even if true--not unless doing so is violation of a lease provision or community rules, or you are disturbing the peace in some way.