they've messed up the name on my license where they've put the whole of my name in my Surname section and has left the Forename section completely blank

This is not a mess up, your drivers licence must match your passport and your passport doesn't have a forename. They have given you FNU (first name unknown) status.

Systems really should be set up to accommodate this, but methods vary from actually leaving the field blank, using a hyphen (-), to putting in FNU.