Seat Leon Aura Radio Unlock Code?

Hi there

I have a Seat Leon 02 plate which went into the garage last week and they had to disconnect the battery. The radio is now locked out and requires a security code. I tried the code on the radio manual, but this didn't work. So I took out the radio and the serial number is different to the one on the radio card.

The serial number I have is SEZ2Z6B1621548

Does anyone know how to get the security code?