You ran into a sandbagger ... believe me, everyone that plays mpc's has done so. I seriously doubt that there is anything that WGT can do about it. I regularly play against 2 or 3 of them. Technically, they've done nothing wrong. One guy has clubs nearly as long as mine, but is still a pro ... and always will be, since he quit playing ranked rounds a few months ago. One is an amateur .... played 3 ranked rounds in March, bought some Raptures, and plays only match play since then.
Like someone said in your other thread, take a couple minutes and check them out b4 you play them. That's really your only defense.