What would you do if someone at work kept spreading bad false rumors about you and people believe them?

They clearly don't like you so they spread rumors and now a bunch of people at your workplace believe them and maybe even result in your getting less hours or skipped over for promotions etc

What would you do?

What would you do if someone at work kept spreading bad false rumors about you and people believe them?
Quit
Transfer somewhere else if possible
Conduct my own investigation to clear my name with evidence
Complain to HR
Threaten to sue if they don't stop
Just endure it until i can make enough money then quit
Other
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What would you do if someone at work kept spreading bad false rumors about you and people believe them?
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