Discord Nitro and being able to change your name and number.

So one of my main concerns with discord nitro and being able to change your name and number to anything you want is the ability to change it to one that already exists and can mimic another person with relative ease.

I've recently started getting messages from random users who have sent me screenshots of my friends sending them toxic messages, which I know they would never do, at least, I like to believe that.

Can you please make it so that you cannot change your hashtag number to one that already exists if your name matches as well?

For example, my @ is Gnomeslayer#5551, if someone tries to change their # number to 5551 discord should also check to see if the @ also matches my name.

You shouldn't be able to have 2 people with the same @ at the same time.