Actually, if it was never served on you, the court has no jurisdiction (power) over you. In theory, you could ignore the case, but that is not recommended: if you, the other side will probably try to get a default judgment aganst you, which you would then have to have set aside and the case dismissed for non-service. You'll be able to do that, but they will then presumably re-serve you again, at the proper address this time, forcng you to deal with this later. It is better to make a motion to the court for additional time to answers, based on the delay in you receiving the summons & complaint.