Your nameservers are ns1.erusya.com & ns2.erusya.com
Both these names point to the same IP 193.70.77.109
For starters this means that you have only 1 nameserver
On that IP you have a Plesk server running @ panel.erusya.com
Your domain zelkoa.fr has no A-record
Your DNS at 193.70.77.109 does...