If it came like that then it was just bad production. plastic welding works. I've done it before and never had problems. If you decide to try it out and let us know.
But that wasn't my only problem. I flattened mine out with a heatgun. But once it was flattened out, it still wasn't made right. I should've bought mine from BaysonR, but it doesn't even really matter now, because I don't even have my car anymore. haha
But thanks for posting that here, hopefully someone can see your writeup from the link you posted here and it will help them.
"I am beyond pissed right now. Yesterday my debadging went terribly, so I had to put them back on. Now this. My auto is starting to slip. I just replaced the alternator. Need new brake rotors. I swear I'm about to just drive this damn car off a cliff."