Knocking on my Door After Hours

At 7:38pm, just a few minutes ago, the maintenance man came knocking on my apartment door.  I asked him, who is it?  He said, maintenance.  I asked him, what do you want?  He said, you called for maintenance?  I said, no I did not.  He said, okay.  

I do not know what that was all about.  But, it is after office hours.  I found his visit strange.  He is the same maintenance man that used his key to enter my apartment unannounced on 11-13-2012.  I do not trust this guy.