its obvious that they don't allow servers on their system.
put up a firewall so they can't port scan you, or get a new ISP.
people will still be able to get your files through push, and your port 6346 won't be open so they may not be able to tell you are running gnutella.
switch to a program that allows you to throttle up/down speed so they won't get so mad at your use of bandwidth, lay low for a while then crank it back up within reason. Gnucleus will let you do this.
pay them for server privledges