Lame reverse delegation at Sprint

I live on a tiny network at 208.31.42/24, which is SWIP'ed via my ISP to me from Sprint. I do my own reverse DNS. It looks like sometime in the last day or so, Sprint's DNS servers stopped serving 31.208.in-addr.arpa, which of course has broken my reverse DNS. Sprint won't talk to me since I'm not a direct customer, and my ISP has gone home for the weekend. Before I call them at home, if anyone from Sprint is listening, could you make NS[123]-AUTH.SPRINTLINK.NET serve that zone again? Regards, John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner Finger for PGP key, f'print = 3A 5B D0 3F D9 A0 6A A4 2D AC 1E 9E A6 36 A3 47