This happened to me six months ago. I've been saving it as an introductary type post for Cödenfreude ever since. Never mind the fact that I already wrote an introduction. *waves hands* Pay no attention to the mand behind the curtain! There is nothing to see here! Um, except this story I'm about to tell.
This is a live chat support with a Register.com representative. Keep in mind, I had to enter my email address before I could even establish a chat session.
Peter S: Thank you for visiting Register.com's Live Support. How can I help you?
Charlie: I am trying to set my DNS servers to use a two third party servers.
Charlie: I am getting the following error message: rahvin.tk2.com is an invalid format for a DNS name
Charlie: why am i getting this?
Charlie: rahvin.tk2.com is the primary server, ns2.afraid.org is the secondary.
Peter S: Please let me know your domain name.
Charlie: longlastinglinks.com
Peter S: Thank you for the domain name. Please give me a few minutes while I check the records for you.
Peter S: Thank you for waiting.
Peter S: Please let me know the DNS servers you wish to keep.
Charlie: Didn't I just tell you that?
Charlie: rahvin.tk2.com is the primary, and ns2.afraid.org is the secondary
Peter S: Charlie, I am sorry the name server which you wish to keep are not in right format.
Charlie: what does that even mean?
Peter S: rahvin.tk2.com name server is not yet registered.
Charlie: with who?
Peter S: Can you paste the name server setting information which you got from your Hosting company?
Charlie: yes
Charlie: it's rahvin.tk2.com, the IP is 158.247.218.187.
Charlie: and ns2.afraid.org, the IP is 69.94.1331.63.
Peter S: Can you please log in to your Account manager?
Charlie: Done. I'm there.
Peter S: Okay.
Peter S: Please click on the domain name for which you wish to change the name server entries.
Charlie: done.
Peter S: And once you click please scroll down now.
Charlie: done.
Peter S: Can you see the option ADVANCED TECHNICAL SETTINGS ?
Peter S: It is at the bottom.
Charlie: yes
Peter S: Now please click on the "Manage Registered Name Servers".
Charlie: done, i'm there.
Peter S: Please wait.
Peter S: Please wait.
Peter S: Can you please answer the secret question on file?
Peter S: [question redacted by Charlie]
Charlie: [answer redacted by Charlie]
Peter S: Thank you for verification.
Peter S: Please wait while I make all the changes for you.
Charlie: um
Charlie: but i want to know how to make them myself.
Peter S: Thank you for waiting.
Peter S: Charlie, I will have to forward your request to our appropriate department.
Peter S: Please be assured they will be contacting you soon with all the information.
Peter S: They will be contacting you through email.
Peter S: Please let me know by which email address you wish to be contacted.
Charlie: charliekilian@gmail.com
Charlie: i have another question for you
Peter S: Yes please.
Charlie: what color is your hair?
Charlie: consider that a turing test.
Peter S: Sorry, please explain.
Charlie: actually, that answers my question perfectly adequately.
Charlie: thanks!