Well it sounds like you ran across someone like me and my friends, start-off with Boot Camp to get a feel for the game. Prestige Master's means nearly zip other than sure they (we) have a feeling for the maps, spawns, guns, etc. Combat Training is another place and the Win-Loss ratios, etc don't count nor does it effect your KDR.
See -> Match Making & Parties - Prior Ban(s), Excessive Reports, Heuristic Detection