I'm a little confused why you wouldn't, in turn, have taken your paralegal to court and sued him/her for gross negligence. [I assume from what was said that you never attended court with them.]
Also, if you were sued and it went to court, in Ontario, there's a mandatory pretrial conference. Thus, if either you or your paralegal attended, you would have obtained a copy of the settlement. The only way then that your landlord (who must be a large corporation if they are using CRM) could have obtained a default judgment is if the agreement wasn't lived up to. Why would you not have asked for the results of that agreement immediately after it was reached?.
The facts presented appear inconsistent and there are too many undisclosed variables to understand what options are open to you. However, suffice it to say that (1) if a judgment was rendered against you that you were not able to defend through no fault of your own AND (2) you can present to the court a basis of what your defence is or would have been to refute the claim, then (and only then) you can make a motion to have the default judgment overturned.
The motion application consists of Forms 15A and Forms 15B, the latter of which is an affidavit of service. The price used to be $40 - I'm not sure if it still is.
Note that one acceptable reason to have a motion overturn the judgment is that the amount awarded was significantly more than what you really did owe. But note: if you are dealing with a large rental corporation, they turf people all the time for rental payment issues and so there's probably no error in the judgment amount. Also note that if you submit a motion without a demonstrating a valid defence of the charge, the motion will be rejected and you will have wasted your $40 and several hours of time. Nonetheless, if you show up and explain to the judge what happened and your financially stressed, you're likely to get easy payment terms, maybe even with no interest. Depends on who you get that day.
Here's a pamphlet regarding how to file a motion in Ontario Small Claims Court.
http://www.attorneygeneral.jus.gov.on.ca/english/courts/guides/MotionsOrdersJan08EN.pdf
The 25 calls a day. You get to talk to a collection agent 25 times a day! Some people get to have all the fun; why not me?
Ray