IMO, it would be wise to send one more note, cc'ing the WG saying, you've been warned, and if you persist, you plan on to pursue the yanking of posting privileges. Reasons: 1) cc'ing the WG in advance gives the community a chance to support or reject your attempt prior to going that far (this is useful). Even silence is useful. 2) basic fairness says you warn people in advance, even if they are likely to ignore warning. 3) if you don't warn first, the lack of the warning will likely be made an issue aftewards, detracting on the real issues.