before u really contemplate on leaving, at least let ur superior know what you feel.
if they don't respond, i guess the best option is to leave (since u're not doing what you want to do)..

speak to ur superior first
maybe they'll change ur position after knowing what is it that u want to do (since they will be reluctant to get a new guy and retrain again)

if they are not responsive, then just go ahead and leave the bas***ds!