Just a thought from a ex telephone operator....
Southwestern Bell has a process where you can change your number temporarily! That way after a month or so you can change it back and by that time (hopefully) the idiot will have given up.

Check with your local company

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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to slide in broadside , thoroughly used up, totally worn out, and loudly proclaiming --WOW-- What a Ride!