As much as I know Free Plans don't last longer with domain. It gets deleted easily. Better you buy a separate domain and then link it to free plan. For now you must contact Godaddy. For new domain purchase do let me know.
Thanks for fast answer !
What I did was to buy a web hosting, business, that came with a free domain name. Payed, and now i can't find it in my account (domain name i.e.)
Hopefully by now, you've been able to access your domain name in your account. If not, then you really need to call our Customer Support team to help you out. They can be reached 24 hours a day, seven days a week. Find your local phone number here https://www.godaddy.com/contact-us.aspx.