Thanks for reaching out on the Community, and sorry for the late response! We hope that by replying now we will be able to help you and any other users who might be experiencing the same issue as you on the Community. Also, we hope you don't mind us helping you in English, since this is the official Community language :)
Just to confirm, did you try to sign up for the Student Discount, but were charged full price? If so, then don't worry - the discount should be activated on your account already, however sometimes it doesn't activate properly.
We suggest you get in touch with our Customer Support team here so that they can take a look backstage and see what's happening with your account. They should be able to sort things out for you.
Hope that helps! Let us know how it goes. We'll be right here if you need anything else :)
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"It's my job to see the world and report back. It's my job to feel things fiercely. And it's my job to be present." - Maggie Rogers