I called them and they said they have a ds-160 confirmation no field because I applied for non-immigrant visa before so the that field is there automatically. They helped me deleted the field now everything is okay now. On the final confirmation letter there shouldn't be a ds-160 confirmation no field. Also for customer service representative you need to listen to the whole self-helped voice message and then you can press 5 to forward to the customer service representative. Hope the people have same situation can have a clue how to deal with that now