How to get money back from itunes?

Well I wanted to buy a song of iTunes so I did then it asked to buy it a second time so I did, I bought it like 10x on one album and now I'm out of money and I can't download any of the songs.
Can I get my money back or get to download my songs.
I tried to download it on my iMac iPhone iPad pc and it still asks for me to download it

Can't

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