I didn't your understand question fully, your name servers are may be down, I think you have directed the ns0.epiezas.com and ns1.epiezas.com to the given IPs and may be haven't created the DNS Entries for that domain. May be thats why while pinging the epiezas.com doesn't replies with IP address. Opening a ticket will definatly help you.
Regards
Mashahood Nizamani