Billing Problem

I have encountered a problem in Billing where by I have created a domain under or.tz and since the zone had less than 100,000.But just after the creation of the domain I ended Up having 42929672.96. Have anyone encountered such an error? How do I make sure it doesn't occur again? Screenshot. Interactive input completed. [Press Enter] Command to issue: create_domain muet-tanzania.or.tz smw1-tznic NULL ns-muet-tanzania.or.tz NULL (1 y) smw1-tznic Do you really want to send this command to the server? (y/N): y Domain name: muet-tanzania.or.tz Created on: 2009-12-17T19:49:39+03:00 Expiration date: 2010-12-17 REG-TZNIC-01@localhost> credit_info go.tz: 20000.00 tz: 0.00 ac.tz: 10000.00 ne.tz: 10000.00 sc.tz: 35000.00 or.tz: 42929672.96 mil.tz: 50000.00 co.tz: 40000.00 REG-TZNIC-01@localhost> Regards, Bryton.