What i did wrong

I played casino with rules 6 Decks, S17, DA2, DAS, ENHC, Early surrender(no surrender against aces)
I entered with my friend to empty table.Beginning was excelent pen was 85% i think.Then some manager game to the left side dealer(I faught that she he controls game (mayby dealer was beginner and he wanted to be sure thet she wouldnt make any mistake or so on)
So i bet gradually 4* was my max.I even started 2*min bet after shuffling.
Next time i feel heat behind my back.I heard some whispering or so,dealer was shifted.Penetr was after hour of playing 50%
After that i immediately quit playing