Can I get into trouble if I lied about my age when I submitted a idea for a product online?

I do this thing called treasure trooper and you do surveys and fill out stuff with your information to get samples of stuff and more. You get paid to do this. There was this thing for submitting a valid idea for a product and so I did it. It asked you if you were over 18 and I said yes even though I'm not because it wont go through and I wont get the money for it. Now, the company is calling my cell phone and leaving voicemails how they want to get together with me to discuss my good idea and they call EVERY day. I dont know what to do. Should I reply and tell them my real age, ignore the call, or should I tell them they have the wrong phone number?