Dear Mojang,
I use the username CalvinGamez or czgz for my usernames. Okay, so I was on minecraft.net, maybe looking to change my username? I don't know. So I wanted to make it calvingamez, but then I deleted that WITHOUT PRESSING change username, and so I typed CalvinGamez and pressed change, and it said username taken. 30 days of using calvingamez, I try CalvinGamez again and it says taken. (I'm not asking for that username back, because now I like it, but, hey, just saying.)
This username is taken by this account: https://namemc.com/profile/calvingamez.2
Until that account changes their name, you cannot use that name for your account