Radio code Renault Megane 2001?

Hi,
The battery went flat and radio stopped working. The radio display says "CODE" and does not give option to enter any numbers, when I tried to enter number I hear a "Beep" sound. Can someone please help me to sort it out? Maybe it got locked out or something else may have happened there???

And also please I need a code for this radio,
Car: Renault Megane
Model No: 22DC259/62T
Prod No : FD0501433580791
Barcode : 7700434422TT206
RN259F13580791
I really appreciate if someone could help me out.

Many thanks