Are you sure you typed in your name correctly? It's best to get into the habit to type in your name Case-sensitive.
If you don't know what case-sensitive means, consider this:
My Minecraft username is Xeadin, but I could do xeadin as well, but the name Xeadin is case-sensitive because that is the accurate name to use. xeadin is also correct, but it is not case-sensitive.
If that doesn't seem to work, I'm not completely sure what the issue is. However, we cannot compensate for the loss because we cannot be sure what the issue is until we identify it.
(
Also, I think you owe me an explanation. We'll talk more in the ban appeals)