Use a different port.
There are a total of 65,535 UDP ports which you can use. But if you are using this to get free internet access (eg: using your internet connection without credits/load on your account) then using other ports will not work if your ISP already blocked those ports.
PD-Proxy works because your ISP opened a port on their network if they already blocked the port you are using then you need to contact your ISP to open them back again for you. We have no access to your ISPs firewall so we cannot open those ports ourselves.