I live in an apartment and some new guys have apparently moved into one of the apartments. They have been shamelessly hacking into my WiFi.
Mine was initially a WEP encrypted network and out of laziness I just limited and reserved the IPS on my router for the people in my house.
Yesterday I had to free up an IP for a guest in my house but before he could join the network these guys connected in.
I have changed my encryption to WPA2 and hope they dont have the hardware/patience required to hack into it, but there are many wi-fi networks in my apartment most of which are secured using WEP. I don't really want to call the police on them. Is there any way to deter them from misusing other people's wi-fi ?

I have gone through I think someone else has access to my wireless network. What next? but I have already taken the steps mentioned there.