Dim,
Even though you didn't debate with them you at least got some building frustrations out, and I'm sure it felt good. I'm surprised JW's are able to evangelize in apartment buildings. My apartment complex has two big No Trespassing, Private Property signs at the entrance to the driveway. If your apartment building has a no trespassing sign they probably could get into trouble. I personally would call the police or at least threaten to if they stopped by my apartment. There are over 800 units here and if I debate with them they will just leave my apartment and continue with the rest of the 799 units, and maybe recruit someone. If I call the police, they will leave.
BTW, You probably are familiar with my apartment complex, since you lived 10 minutes away. I live at the Korman Suites Meadowbrook.