Actually - I wouldn't Godaddy is well known for charging their clients money if a TM issue arises .... If you refuse to pay it - Your account and any domains within it will be held til you do.
MIR - is the Domain actually generic ? Is it really worth fighting for (Monetary Value) ? If so - Bite the bullet and consult a Pro.
"Ads" of any kind have been used against Domainers for a while now in cases like this , No big surprise there. Even "Categories" showing up on a Basic Portal Lander count the same I suppose.