problem with a domain with old dns servers

Hi i have a problem with a domain.
I registered it to register.com a few years later y moved it to another hosting provider.
A few months later i moved it again to other hosting provider.
now if i do dig mx domain.com
i can see the old and new domain server
dns4.register.com
dns.oldprovider.com
dns.newprovider.com
dns1.newprovider.com

I wish to know how can i delete dns4.register.com and dns.oldprovider.com.
i wish to have just two dns dns.newprovider.com dns1.newprovider.com

Anyone knows how?

Thanks

 

 

 

 

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