Deny my I-751

i went to my interview, i got my letter in the mail letter of intent to deny my peition to remove conditions of residence ( I-751) because lack of enough edviences , also the fact that my wife had two kids for another person while we was married, and my wife and i didnt state that during our interview . what can i do ? ( should i file a I-751 Waiver before the 30days) thankyou