OK, First I would redo everything (unlocking, etc) as per DrPuttingham above. If you really successfully flashed a custom rom, its unlikely the extended rom would have the Cingular stuff still there. If you are stubborn, and just want to get rid of the Cingular stuff, do a hard reset, and when you get the message saying 3 seconds to customize, do a soft reset before it starts (put the stylus in the reset hole). Then the extended rom will not load.
Current device: N7100 Galaxy Note II, Omega Rom, Perseus Kernel, TWRP recovery
Mods: Just Simplistic now.
Previous devices: iPhone, HTC Fuze, Hermes, Wizard