nameserver - How can I prevent someone else's name server registration from pointing to my IP addresses? (i.e. change com zone file)

I got a new IP address block from my ISP; lets call it 2.2.2.0/25.

2.2.2.1 and 2.2.2.2 get frequent DNS traffic; looking at the traffic; it's destined for the nameservers ns1.tp.com and ns2.tp.com.

tp.com has ns1.tp.com and ns2.tp.com as their nameservers; so no content is available on that site.

ns1.tp.com and ns2.tp.com are registered with the zone authority for .com (is that ICANN?) --- how do I go about notifying the proper authority that those IP addresses are mine now and that this nameserver entry they've got is stale?

EDIT :

ns1.tp.com are A records; but they are name servers registered with whoever manages the .com zone. tp.com's nameservers are ns1.tp.com; which are my servers; so it's definitely not still being served up as an A record.

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