You can buy the badge on its own part No F1090813. I paid £10.01 for it.

You need a fine flat blade driver to lever the metal badge off. Clean any old glue residue off and stick your shiney new one on. Avoid leaving the rear of the car facing into prolonged periods of harsh direct sunlight (Not a major pob in the UK lol) and dont pressure wash to close to the area.

Hope that helps.