Name-server IP's ?

Need some help here...

I had a client who had NS's and then left for a normal virtual account at another provider.

Now said client has been gone months, and still has their NS IP's pointed to MY IP's.
Now these NS's can not be removed from my 'manage name-sever list' in WHM.

Is there anything I can do short of contacting the actual client?
Who to this point has refused answering 2 months worth of emails, asking to remove the NS's from their domain registrar.

Any advice ? Name-server IP's ?

 

 

 

 

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