Retarded players ignore warnings and execute /premium twice

[MithrandirCraft]

Is your feature request related to a problem? Please describe.

Players tend to execute /premium twice, completely ignoring my message warnings. Once they get locked out of the server, they come to the help section on discord asking to get unlocked.

Describe the solution you'd like

Maybe the command could only be confirmed by doing some additional harder action such as copying some text or numbers. (You know, like when you delete a repository on github, and they make you write the name of the repository, only harder, since in MC you'd have to copy the text manually)

Describe alternatives you've considered

Telling players how retarded they are doesn't seem to do it.

Additional context

Once I set the players in question back to being cracked, a "Sending request..." message appears, however, it never confirms that it worked. It does seem to work though. Maybe I should just change the message to "Done" :'D

[YellowZaki]

Or maybe instead of typing twice the comand, request the player to quit and join the server again within x seconds. On that server rejoin, enable premium mode for him. If it successfully join with premium, add it to premium list.
This way it 100% confirms that's their account.