Do you have other isp options such as a competitor isp? If not, lay low for a while before using p2p again. Perhaps that will stop their filtering temporarily. I'm purely guessing they're filtering the top bandwidth users or those that suddenly use more than they normally do as compared to them putting this p2p filtering in place for everybody universally. It's hard to know because different isp's may approach this in different ways. Hopefully someone wiser than me will be able to advise you.