OS X Mavericks :: Won't Forget WiFi Network And Password

I originally logged in at the free and slow level, entering my room number and last name to confirm. Then I found out that by joining the hotel's loyalty program I can get the fastest speed for free, but I can't get back to the login screen. I've gone into Network Prefs > Wifi Network > Advanced, to delete the network name off the list, but even after a restart, my MBP just logs right in at the slow level. 

I've deleted all networks from the list and saved it, yet it just logs right back into the slow level. I looked all over Keychain and don't see anything relating to this network anywhere. Everything I try, my computer just keeps logging back into the slow level. The hotel has even deleted my login on their end, and somehow I just get right back into the slow level without entering my room number again. Where is this password and network info stored so I can delete it?

Info:
MacBook Pro with Retina display, OS X Mavericks (10.9.4)