[Creative] Plot problems

Hi. So basically, I did /plotme dispose then I did /plotme claim and now I can build BUT when I do /plotme add [Player] it doesn't let me because the command says that I do not have permission to do this even it's my own plot and now I can't do /plotme dispose because I do not have permission to do this even this is actually my own plot. So please help me.
This is what it told me:

 

This thread is 5 days old. Sorry for tagging.
@KatoKillsMyGPA
@PandaBear__
@Taylor
@Badlerner

 

Still an issue?

 

You probably changed your MC name.
You cant use any /plotme command, but you are allowed to build on it...
It's the same by me.
C:

 

Handled?

 

Not yet

 

I actually don't have proof that it is my plot because I just made it and then I changed my name

 

I'm sorry to say that moderators cannot help fix your plot because we don't have the permissions to claim other plots for people. But if you wish for your plot to be fixed please send an email to [email protected] where an admin can see your request providing the following things

• Problem With Your Plot
  
• Your Old IGN
• Your New IGN
• The Plot ID (Located on a Sign on the Front Right Corner of your Plot)
• Valid Proof of You Owning Your Old IGN (Using https://namemc.com/ is the Easiest)

If your problem isn't fixed within a few days after sending the email try sending another one but please do not spam the email. If not after that then try sending one every few days.