If an apps doesn't perform

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How can you get reimburse for an apps that doesn't fulfill the promise or work?
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"NO WARRANTY: YOU EXPRESSLY ACKNOWLEDGE AND AGREE THAT USE OF THE LICENSED APPLICATION IS AT YOUR SOLE RISK AND THAT THE ENTIRE RISK AS TO SATISFACTORY QUALITY, PERFORMANCE, ACCURACY, AND EFFORT IS WITH YOU. "
http://www.apple.com/legal/itunes/us/terms.html#APPS
You can try reporting the issue:
http://support.apple.com/kb/HT1933