Just looking for some feedback.....

I had been having some problems with my LW account and the firewall symbol being present even though my firewall was set to allow LW. So, I was told to contact my ISP to find out if there was an internal firewall and to see if they could help me configure it. When I called my ISP they told me they don't allow LW or any peer to peer sharing program?? What kind of garbage is this? Can they really do this? I just find this so absolutely ridiculous! Has anyone ever heard of this? I'm so disheartened by this. The weird thing is that I had been using limewire for about 8 months with no problems and then all of the sudden, I couldn't connect.