hopefully some kind sole may know the code and post up/pm you.
but maybe its on the side of the unit
or somewhere in your paper work
or take a trip to renault and ask them,
or pay to get it unlocked
or join a renault forum and ask there,
Did you get a user manual for the radio when you bought the car? That will probably have a sticker inside with the code number as well as instructions on how to enter it.