We experienced the same problem. With great difficulty, we convinced Microsoft South Africa PSS to open a support case (they point blank refused to do so, stating that Windows 2000 is in extended support, and they don't care if it's a security fix.) The case reference number was SRQ060704600726.
It took LOTS of convincing and escalating to managers to get them up to speed on their own policy. The engineer that eventually logged the call said "I'll sneak it through for you, don't tell anyone I logged it free of charge."
They summarily closed the call two days later with a workaround of "add another digit to the dial-back number" and a freebie of "we'll call you when we get an update on the issue."
I'm trying to re-open the call six months later now, as we never got the promised update.
Shocking.
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