EDIT: Beaten by Steve
Did you do the reset properly?
I would normally work 9 time out of 10
BRANT RESET
• You need two people to do this
• Your car battery must be fully charged and in good shape
(1) Disconnect car battery negative terminal for 5 to 6 minutes
(2) Hold down 0 and # at the same time on the keypad and reconnect the battery whilst still holding down
(3) Release 0 and #
(4) Enter 0 four times on keypad
(5) The keypad is now reset to accept your PIN