Meh, I don't need to charge back. Simply not buying RPs is more than message enough for me.
Same message gets through; "I am not pleased and I am no longer financing your game. So from this point on I no longer care what you do/don't do with it."
Anything else is pointless.
Same option everyone here has. To simply not click on that to that "ADD RPS" link up there ^. Easy as Pie (yummy!)