How many network appliances do you have currently running on your network and what are they. Has you ISP provided a broadband device that you are currently using? What is it Mfg and Model Name and Number? Is it WiFi capable?
Do you have any additional applicances? Switches, Routers (wireless or wired), Access Points, Repeaters, Extenders? If so, how are they configured? In other words what single device is responsible for wireless security on your network? Is it broadcasting its' SSID? Are other devices if present DHCP capable? Do they have their own built in security configuration.
Draw me a picture, use your words, screen shots, actual images of the devices, I can help but without knowing details as to what we are specifically talking about, I am left with only my own imagination, which while surprisingly robust, is of very little value in addressing your problem.
Regards
Randy