DNS Manager no delete DNS entry

[Dizfunkshunal]

Ok I have a diz.com i add co domain dfaddons.com well now I want to give dfaddons.com its own account and website. Only problem is I deleted it as a co domain, I deleted the dns record in the dns manager and empty the bin. still the dns record is there and will not let me create an account using that domain name. Yes i search and found nothing that told me how to remove the dns entry or how to fix the dns manager to remove it when its suppost to. any ideas?
btw i used the Centos how to perfect server tutorial to set this server up if that helps