Disco 2 Urgent help needed

I have BIG problems first it was the Engine immobilizer, i believed it was the battery in the key fob so changed that (cheap option) but made no difference calls landrover for EKA code i tried entering the code but like a muppet, i did it in reverse locking it rather than unlocking at the start of the process. Now i cant even unlock the car with the key Have tried the default and the exact EKA but still locked any help no joy any advice would be appreciated greatly
2001 Y reg
Discovery 2

If you look in the handbook it states that you have to wait a certain amount of time after entering an incorrect code before you can try again. Not sure if this is your problem.
Griff

Are you sure the stealership gave you the correct EKA code?
Possible the previous owner changed the EKA code?