This the config for redirect users to a specific web page that no pay the bil...it works fine.
add chain=dst-nat n sr-address(the address of your client, in my case are static), protocol=tcp, src-port=0-65535,
action=dst-nat, to address= 200.30.xxx.xx public Ip of webpage with the message, to ports=8080(my webserver is in 8080port)
i expend about 5 hours to discover it.......