I am not able to add my dependent details

I am currently facing issues with the US visa website. i am new for US visa booking. actually My wife and child’s details were mistakenly deleted, and now I’m unable to add them again as it shows that they already exist. I sent a message through Feedback/Request but i didn’t get any solution. so kindly help me to solve this issue. i am planning to schedule the appointment this week. please help me.