radio code on 2002 Mercedes-Benz CLK55 AMG

ok so i unplugged the battery and the radio went into code mode. i took the serial number went to the dealer they gave me 3 codes none worked. they said they cant help what can i do? how do i unlocked?

1 answer
suggest removing the radio and taking it with you to the
dealer. this is the only way to make sure you have read the
serial number correctly. if you don't get the right code, this radio will not work---ever.