How to delete multiple contacts at once on the iPhone?

My mom got an iPhone and she set herself up on the iCloud account. Then all of her 600+ contacts ended up on my phone, even when i erased the iCloud account, i couldn't delete hers while retaining mine. It is a huge pain to go through and manually delete every single one… Any suggestions?

Press iCloud from settings. Then if contact switch is turned on. Turn off.

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