Hello and welcome,
This agreement would typically be enforceable, as long as it is not inconsistent with your divorce
decree. If he stops the deductions without your consent and in breach of the agreement, then you could typically sue for any damages sustained as a result of his breach.
At this point, you could sue for damages for breach of contract as well typically since your credit has suffered due to his breaches of your separation
agreement, so this new agreement would be characterized as a settlement of your current claim.
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