said by Ahuacamolli:Without a lawful warrant, your provider can't/won't provide documentation they might have in the way of logs evidencing what MAC addresses were used to make connections on the internet via your router and internet service.
1. Regularly changing your WEP password, and not using simple passwords
Why would the ISP see any other MAC address besides the device connected to his modem, which in this case was the router?
Also, do not use WEP at all, why even leave that as an option? He also admitted to having the security type changed to WEP, which, IMO is a mistake that cost him $600.