i'm really distrubed with m3 service

[dreemtobd24]

i got a vps m3. where i created a user c panel . that c panel allowed to add 5 domains. where i got a main domain . yesterday i add 2 more domains . and they was working good after pointed them with server name . domain registrar is co.cc. but after some moment i faced a problem with main domain site, . then i rise a ticket . after that i find out my problem and i fixed it and close that ticket and to solve this problem i reset my main domain to previous name server.. but today when i check that 2 domains i found it's not working today !!!! what happened ??