fleabay quality tends to be dodgy at best. I bought a £15 one but the quality was so crap, I didn't bother and instead spent fair whack for a proper one.
The GTI badge should unclip and if it doesn't you're doing something very wrong. Either way, you can do what I did:
- heat the red GTI up with a hairdryer
- use dental floss to prise it from the backing plate
- do the same with the silver GTI on the grille
- reheat the sticky bit of each letter before you apply it to the grille, taking your time to get the letters in the right place.