dduetto wroteUse this Security
WPS Enabled: No
Broadcast Network Name: No
Security Mode: WPA-PSK
WPA-PSK Preshared Key: [Your-New-Password] ******************
WPA-PSK Encryption: TKIP&AES
WPA-PSK Version: WPA&WPA2
and don't forget to change your WPS PIN cause if he success to crack your router default pin even you change your password he can re-get the new one so quickly
New routers allow maxi 3 attempts to wps.
You can have some fun with your neighbour, mitm his ip and redirect the web pages to a local apache server and write in it stop stealing my internet or something like that