Where are you based, Vic? Different countries have different warranty policies...
I am a moderator on Roland-arranger.com (and prior to that, the Danish G70 Users Group), and haven't heard yet of a single touch screen that failed completely. There HAVE been a few screens that either a) had a striped pattern through the screen, and b) the screen has been offset partially outside the window, making some controls impossible to get to. Both of these things have generally been put down to rough handling by the shippers.
If you payed by credit card, you MAY be able to nullify the transaction, get your money back, and then buy another one. But I am not positive on this. Contact your credit card about this. Other than this, I am afraid you may be stuck with Roland's glacial warranty service. But don't give up!
COMPLAIN...! Loudly and repeatedly. Call your country's Roland headquarters. Bitch, bitch, bitch! Call the repair place (get a 1-800 number!) and remind them daily of your problem. Tell them that for the exorbitant price you just payed, service should be faster...
The squeaky wheel gets the grease....
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An arranger is just a tool. What matters is what you build with it..!