Unfortunately, without the owner of the servers, nothing will work.
The only thing I can advise is to find another server.
There is a server "Fun and fight (Classic Mesa & Dark mesa)", there are a lot of different things.
There is a "Grand Central", there the map is a bit revised.
There is also "something", but I don’t recommend playing there, as one of the cheaters admins and other administrators don't want to ban. Normal server, nothing special (if you forget that the cheater is the admin).