You say you "called in" to set a trial date. You cannot call in.
Clarify what you did. Did you send in the notice, did you go into the court to set the date? Or did you just call in on the phone?
The motion appears to be that the crown is looking to set a date, but it may also be trying to convict you on the 25th because they are bringing an application of some sort and relying on the cops sworn affidavit in this application.
You should call the courthouse tomorrow and find out what this is all about.
It sounds to me like the cop isn't available on the trial date set for January and they want a new date.
This could work in your favour. Delay the hearing as long as possible. If you do not get a trial within 8-10 months, they cannot try you. This delay is being requested by th crown.
Do not agree to it.
The crown is using a Affidavit from the cop. The Affidavit has been in the custody of the crown for weeks yet they never sent you a copy of it. You'll only see it on the 25. They have failed to provide you disclosure.
If what I say is correct, ask for an adjourment on the motion so you can seek legal advice requiring the failure of disclosure and the Affidavit.
Do not agree to a change in trial dates. If you do, the delay will not count with respect to being tried within a reasonable time.