The guy playing under 1488 (a regular) was warned for the bad name and he changed it 1489. I am certain it was an honest mistake, since I know you're a cool dude and if you had known what was problematic with 1488, you would not have used it.
The admin who banned you (I assume it was Ernie), had an eye out for the above mentioned player, in case he ever used 1488 again, he would be banned on spot and I am assuming Ernie just thought it was that guy going back to his old name.
Wait for Ernie m8, I am sure he will resolve your ban