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.
I hope you found my answer helpful, even if the law is not in your favor; please click on the GREEN ACCEPT button above for my answer. This is necessary for me to be paid for my work and so that I can get credit for assisting you. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated!
If you have additional questions, please keep in mind that I do not know what you already know or don't know, or with what you need help, unless you tell me. Please consider that I am answering the question or question that is posed in your posting based upon my reading of your post and sometimes misunderstandings can occur. If I did not answer the question you thought you were asking, please respond with the specific question you wanted answered.
Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous. Thank you.