Who Me Too'd this topic

I got an email at the end of August telling me that my student discount was about to end, however I'm still in school so I clicked the "Extend discount" button in the email. This simply took me to a page for enrolling in premium, at the student rate, for the first time. I just looked at my credit card bill and I see now that I've been charged the full-price premium rate for September and October, so clicking the "Extend discount" button does not seem to have done what it should have. 

I saw another thread which referenced a company which verifies eligibility and I've never been directed to them; maybe that's the problem? 

How can I regain my student status and get a refund for the overage I was charged for the past two months?