give them another chance before you scream - then scream.
they do spend a lot of tech time on the phone with customers - more than most companies - and they are good about replacing any parts giving you trouble. sorry your problem got lost in the sauce.
not that this is an excuse, but could it be that part of the reason you're taking it hard right now is that the baby is due? try to be a little patient and then blow up.
soon you'll have a little bundle and this will seem less important.