If it is
this truck then it is definitely a 1/2 ton. Hey, there's nothing wrong with your complaining, I would actually call the guy on that. It may be buyer beware, but there's no reason to call it a 3/4 ton when it obviously is not. Also, it may be possible that the cab came off a 3/4 ton. The cab VIN would reflect that and perhaps that is what the guy is going off of.