Warranty question

[OffRoadin]

Ok so I called the dealer and let them know that the chrome on the spare tire is peeling off (never been off the carrier) So they tell me to bring it in so they can take a look at it, but I have to bring the whole car. Not a big deal... So when I get there they say it's a cosmetic issue and they won't replace under warranty?

But didn't I kind of explain that the chrome was peeling off. I didn't say that it wasn't useable. So now what they are saying is since I bought it used and not from them they don't have to replace under warranty and that it's the responsibility of the dealership where I bought it (but the place I bought it from isn't a Hummer dealership).

So my question is shouldn't they replace under warranty regardless if I bought it from them or if I'm the 1st or 100th owner... It's still in warranty.