I got a (smaller sum than Jasons) settlement offer from them after threatening to take them to the cleaners.
The number was 021 1666333 which they obviously "absorbed" internally. It was reactivated and was in use two days after mine went "off air" two friends had the next decades in series which made it very annoying.
1 year on from that.. The replacement SIM I bought (boring number) was deactivated, even though it was in current, regular use.
I also discovered that while I could not make any outbound calls, SMS, MMS, and all GPRS data and incoming calls was still working, and stayed working, unlimited =) I decided to accept the bonus free usage, 9 months later, it became live again and billing resumed (Siebel was introduced)