OT: Propagation of my NS records?

[online-reg]

Hi All: I think this is a little OT, but I’m wondering why changes to my NS records aren’t propagating when my NS is authoritative for my domain?

enigmedia.com is registered at NetSol and delegated to my NS:

ns.enigmedia.com (running on bind9/fedora)
ns1.enigmedia.com (running on bind9/Freebsd)

Global TTL is 3h and TTL for the “NS1” record is 1200, but after changing the IP address of ns1 more than 24 hrs ago, it is not being picked up by NetSol’s servers.

NetSol is returning the old record: 209.159.154.165, while my zone file has 216.218.228.131.

I’ve seen this issue reported over the years, and the recommendation seems to be “complain to NetSol”.

Just wondering if something in my zone config is wrong, or if this is normal for changes to NS records? NetSol is just ignoring my TTLs and caching the old IP for as long as it wants?
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