Create a Hidden Network

The person you spoke to has no idea what they're talking about because it wasn't on their script.

Here's how you do it:

1. Important: I would find a laptop that you can wire in with a lan cable in case things go bad.

2. Go to http://192.168.42.1 on the laptop and log into the wifi settings (unless that IP's changed on your setup).

3. Make sure you jot down your wifi info for DHCP, particulalrly:
 a. The wifi net name (whatever you have it set at - each band 2.4, 5, 2.4Guest, 5Guest will have different net names)

 b. The subnet mask (usually 255.255.255.0)

 c. Router IP: (usually 192.168.42.1 if the same as in #2)

4. In the Wifi Settings box:

  a. click on 2.4GHz, then uncheck SSID Broadcast.

  b. Repeat for the 2.4GHz Guest
  c. Repeat for the 5GHz
  d. Repeat for the 5GHz Guest
5. Double check everything on the 2.4/5GHz w/wo Guest tabs, then click Save Settings.
Voila... no one will be able to see your network on their list.

Edit: Oh... make sure you test it before you disconnect your wired laptop.