Duped. Sort of, sort of maybe not. You pay money to get the degree, the diploma, whether you learned anything useful or not is irrelevant in many fields.
You have the degree, perhaps with a 3+ GPA. What did you learn? Meh.
I was ignorant as a stone after my BS. I just didn't know it. I was still ignorant as a PhD, the difference was, this time I knew it.