Once they send you a motion and you reply to it, then under rule 9a they should file the motion (and your reply) with the court.
The other party may not revise the motion and submit it with your response. There may be a very small amount of leeway for the correction of a harmless clerical or formatting error, I'm not sure.
The other party may not decline to submit the motion at all without notifying you, since they have forced you to respond to it.
Finally, the other party may DEFINITELY not revise a motion, fail to send it to you, and claim that you did not respond.
You should immediately file an appropriate motion for relief. Do not delay. I strongly suggest you contact an attorney, as Superior Court motion practice can be quite tricky.
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Plaintiff is not suppose to make changes to the motion. He can submit it with your opposition or withdraw it. If he wants to submit a new motion, it must comply with Rule 9A. You are not suppose to file with the court. Only the moving party is suppose to file with the court. The only "remedy" is that the court has a person assigned to manage Rule 9A motions. Call the court, find this person, and talk to the person about your issues.
Under Rule 9A a party may serve a motion with a supporting memorandum of law. The non-moving party may then serve an opposition. The moving party must then file the whole 9A package with the Court within a specified time or withdraw the motion. The moving party should not make substantive changes to the motion or supporting memorandum. If so, seek relief from the Court to file a supplemental opposition, if necessary. You should also note that a moving party has 5 days to request leave of Court to file a reply brief to your opposition if something in the opposition could not have been addressed in the initial motion or memorandum.
Mr. Thomas is licensed to practice law in Massachusetts. This response is not legal advice and does not create an attorney/client relationship. This response is in the form of legal education and is intended to provide general information about the matter within the question. Often, the question does not include significant and important facts and timelines that, if known, could significantly change the reply. Mr. Thomas strongly advises the questioner to confer with an attorney to make sure he or she gets all relevant information to make informed decisions about the subject matter.