[HELP] On Student Subscription for 1 year but Spotify charges me the full $10.70

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So I started my freshman year of college last fall semester, and since then I've been using Spotify's Student Subscription for $4.99.  But I recently noticed that for the past 2 months, Spotify has been charging me the full $10.70.  Is there anyway that I can get my money back?  Even though it's $10, this broke college student values every dollar he can get.

Thanks and sorry for the inconvenience!