It's under warranty, and the dealer pointed out that the tyres are defective...
Why aren't they pursuing a warranty claim for you?
Oh, no, wait.. you've been driving on them, so that voids the warranty, I forgot that bit. (yes, for the sarcasm-impaired.. that was it, right there :-) )
Seriously, whether warranty or not, I'd replace them before you drive much farther.
IanP, the man from Scotland
Jay Feather 19XUD, pushing a Jeep Grand Cherokee