Got charged twice for the same software

So yea as a studenti ordered windows 7 for 40$, and received 1 key, not 2, but i got charged twice 40$ on my credit card...

Would any1 be kind enough and give me the link for where i will fin help about this?

(sorry for my english, this isn't my native language)

contact the store where you ordered it from, or your credit card company

tell them what happened and they will sort it

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