To me this is not sufficient evidence to call pga.

Blue flagging purp was surprising but he was busy with teal and might have lost that fight if teal had not lagged. You not killing yellow quite early in the game was stupid. Purp not trusting your vflag is within limits though not nice - I don't know your history. This game is not so much about being nice. He did accept your real flag and let yellow die. Clearly there was not 3vs1 teamplay or you would have been 4th.