A book I highly recommend is called The Gift of Fear. The author is a nationally-known expert on violent behavior. If someone is being stalked/harassed, he advises keeping your old phone number but letting the answering machine/voice mail pick up. This way you have a trail of evidence. Have a detective (or whoever) monitor these calls so you don't feel the stress. Meanwhile, only give your new phone number to close, trustworthy family and friends. Let your sister's ex believe that you all continue to use the same old phone number.
Now's a good time to create a safety plan.
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