How can you stop someone from continuing to accuse you of things that you aren't doing but they think that you are doing them?

Being accused of doing things that you are clearly NOT doing, yet they continue to accuse you even though you have told them that you aren't doing them; then they keep adding more things that you didn't do. How come they won't stop doing this? How can you stop them from doing it?
How can you stop someone from continuing to accuse you of things that you aren't doing but they think that you are doing them?
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