I think you should be able to delete a WordPress account.

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  alliwanttodoisdeletetheaccount · Member · Oct 14, 2015 at 7:53 am

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  How do I delete a WordPress account?

  Your system just says I can’t. That’s ridiculous. Why not?

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  kikiboss · Member · Oct 14, 2015 at 8:21 am

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  https://en.support.wordpress.com/deleting-accounts/
  I think this is what you are looking for.