If USCIS issued you some sort of travel document that allowed you to legally leave the US, and ICE still has your passports, you are supposed to come back and attend your hearing. Without all the facts, that is just a guess. You need a one-on-one consultation with a US immigration attorney. About how to return, and how to prepare for your case. If you lose, most likely you may be subject to a return ban or voluntary departure. Either way, you will be deported with strings attached.