How can I get my money back/shut down a non-licensed print stand?

Question Details: I bought a printed sweatshirt but didn't realize how fake it looked until I got home. The shirt is clearly not legally printed and since it's a huge logo, I'm sure they could get into major trouble. How can I get my money back and stop them from selling to others? They are a small vendor in a mall. Also, could I get in trouble for buying it even though I didn't know at the time?

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