First check the firmware. The current ver is 1.0.4, if you have an earlier ver, call Inovonics and get the current chip. The ones they sent me had 1.0.4 written on the chip in laundry marker. Then, (at least on the ones we have) all the AF's will appear in the setup screen. Delete them and it ought to quit telling people's radios 'where to go'.
Assuming you're in the US, you should also set the box for "RDBS' not "RDS'. I believe that setting is in the firmware.