One thing I did, when my last ex was whining about how much money he got after we sold our winery property, was to have my lawyer send him a letter directing him to contact her directly about any future questions or concerns he had about the division of proceeds from the sale, and NOT to contact me.
Of course, it didn't have the force of a court order, but he still followed instructions. I didn't get any more emails or phone calls about it. He sent one more letter to her asking for more money, and I actually drafted the response I told her to send, which was that I was responsible for more taxes than we estimated and actually, he owed ME $3,000, but I was willing to forego that UNLESS he persisted in his demands for more money, in which case we would be seeking that $3,000.
Never heard another peep out of him.