Volkswagen might give you the code.

There are many online sites will give you the code for a small fee. As far as I know, the codes are somehow calculated from factory using the serial numbers on the sticker on the radio. There is a software you can use to get you this code - basically you just enter you serial number and magic will happen.

If you search online you might get lucky and find a free version (cracked) of the software and do it yourself. It is always handy to have such software incase you or even forum members might need it