Zte cricket phone has been hacked


I need help to get my phone back. Seems a crazy ex boyfriend has

my IP address and I now have a Mac address. He recently bought a Chromecast I have no idea if this has anything to do with it but when I pull my wife up there's more then 1 name but all have the same IP address and proxy. I know nothing about phones so this is all new too me. Help someone!