I had that happen to me years ago with a coffee pot. I kept running water through it and thought after the newness went through it it would stop, but that should have only been a couple times. I finally took it back to the store for a replacement. I couldn't get the burned plastic smell from it and surely wasn't going to drink anything from it!!
Sorry, was a little off the subject, but that is what came to mind when you said you couldn't get the smell to go away.
Barb