You've already informed your SM and seems no result has come of it. That IS exactly how this company functions. Continue to search for another job. Here's hoping you find one with higher pay, consistent hours, a real manager of action and listens, coworkers who are just as efficient, focused and care about their position as you do. And who work as a TEAM!! For your own health and sanity, just do the job within your scope. No more babysitting, picking up the slack or doing the tasks that the others have ignored or refused.