I'm very disappointed for what this server has done.
Impersonating another server's owner and doing crap spam via private messages is lame.
It is shameful that a server has to spam to get more players, even if there's a bad relationship between both servers. As far as I know, no advertising has been done in Ruincraft related to that server, for which I feel this has been a more than unprofessional behavior. Players who have left there and came here were banned by some staff members, which isn't right, but that isn't enough reason to publicize your server there.
You should man up, be professional, and get your own players through here or server listing websites, since it doesn't affect you to have your entrance to a place you'll never return prohibited.
I personally do not recommend RuinCraft due to the measures they take to have more players.
I hope you reconsider your actions and decide to change for good.