Massive amours of cracks on dash-board.... Lexus of Chls not standing by product

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I have my car serviced at the Lexus dealership here in Charleston, SC. About 1 year ago I noticed a fine hairline crack from the passenger side air vent. I happened to have my car brought in for service around the same time and pointed it out to the service manager. He said they couldn't do anything but would call "Corporate" to see if they would cover the cost of the part... they called me about 1 day later and "offered" a 25% discount but I would have to pay for labor... Total price for part was $1500 and labor another $1000... the 25% part discount was like a slap in the face... I certainly expected more from Lexus!!! We have been loyal Lexus owners (5 of them) but this will be the last, too bad because they run great! they just fall apart cosmetically. The cracks are now covering the whole dash... I stopped counting after 18 and the one over the airbag is really deep.... I sure hope it won't disrupt the efficiency .... oh what a legal mess that would be for Lexus!!!!! If anyone in Chs, SC has any advise please let me know. Thx