Account Migration?

Hello, I have ran across an issue involving my account being migrated over to Mojang. Every time I now try to put in my credentials on Minecraft an error pops up saying my account was migrated to Mojang. I have never migrated my account before over to Mojang and the account I did think it was on was not on it at all. I don't know whether or not to talk to support about this or not. My account was working perfectly fine up until after Easter and then shortly after that it would pop up this error every time I would enter my account in.