Samsung Tocco s8300. asking for code

my phone was playing up and when i sent off for repair they said it wasnt fixable.
they said it had moisture damage.
When it was returned i switched it on and it asked about a new software update, i clicked ok and then it asked for a code now.

when i switch it on a box appears looking for a code.
iv tried all the ones i can think of including 0000, 1234,9999, but nothing works,

it appears not to like any number less than a 5 also.
I cant afford to send off again does anyone have any ideas, phone is only 6 months old and was given as present and i have no retailer details anymore.

many thanks

anipani