Someone in your situation may wish to send them a strong cease and desist letter
just like you alluded to, mentioning that unless they stop, you would (a) seek a restraining order and/or (b) seek a suit for intentional infliction of emotional distress.
For a restraining order, see here:
For a lawsuit for intentional infliction of emotional distress, the threshold test to be followed in assessing behavior claimed to constitute the "intentional infliction of emotional distress" is whether such behavior is "so outrageous in character, and so extreme in degree, as to go beyond all possible bounds of decency." Ponton v. Scarfone, 468 So. 2d 1009 - Fla: Dist. Court of Appeals, 2nd Dist. 1985
Yes, such a letter may go a long way to scare them into stopping the harassment
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