You need to see a local attorney. There are several possibilities that come to mind. First is to see whether her conduct violates any local criminal statutes. For example, she might be guilty of making "terroristic threats" depending upon the statute that exists in your area. If so, you could possibly seek a warrant for her arrest and that might discourage the behavior. Another possibility would be to sue for libel (written slander) or defamation given the false information she is spreading about you to your employer. Finally, on a practical note, you may wish to block her phone number or change your cell phone number to decrease her ability to contact you in a malicious manner. Good luck!
You might want to pay a lawyer a couple hundred bucks to send her a letter threatening a lawsuit if this is not stopped immediately.
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There seems to be a lot going on here, and clearly difficult for you to fully describe in this question. In several parts, it sounds like you have a situation that warrants you reporting their behavior to the police yourself. It is also possible that as they report your alleged behavior to the police that you could potentially face some charges.
If this were to happen, or even in preparation for the possibility, it may be important to consult a defense attorney that can do the proper research and discovery to prove that you are not actually committing the offenses that they are accusing you of.
I have a good bit of experience handling cases where an ex and their current significant other will choose to report false claims against someone just out of spite. Its a very trying situation to have to deal with.
If you need to talk to someone with experience, my information is listed in my profile.
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