Handles badly

• Exploits or abuses
• Wrongfully applies
• Takes unfair advantage of
• Applies wrongly
• Invalidates a warranty, perhaps
• Invalidates the warranty of, in a way
• Employs wrongly
• Applies incorrectly

Wiktionary Word definitions in Wiktionary
n. (plural of misuse English) vb. (en-third-person singular of: misuse )