vauxhall corsa cd player problem- can anyone help?

[dearboy]

Took the girlfriends corsa 52reg for some work at a garage 2 weeks ago which required the battery to be removed. As a result when she came to use the radio/cd again it was asking for a code in safe mode which was never the case when switching on the ignition before. No problem we thought as the code was in the bookwork that came with the car.
However after 3 attempts at putting the code in after some very vague instructions it is now stuck with the word '7 safe' and will not respond to any other buttons or allow us to do anything else even though the book says you get 10 attempts hence the first 3 times it counted down '10 safe, 9 safe etc.
Its now stuck at '7 safe' and has been for a week. We have took the battery off, took the fuse out, scoured the net for info and even looked in the unlocking thread on here without any joy.
Does anyone have any ideas??
Thanks.