can you try putting ice on it to slow the bleeding to see where it's coming from and then maybe try some quick stop/corn starch to help stop the bleeding.
Not sure if you can post pictures yet but that would be helpful to show.
Greetings and welcome to BYH. Sorry you're goat is having bleeding problems. Normally you can cauterize with the iron... Make sure it's fully heated. You may have to locate the vessel to completely stop it. Sugar will also help clot if you don't have corn starch. Part of the problem may be the age of the goat... Disbudding is usually done at a much younger age before the horns develop major blood supply arteries... Once the horns start really growing, it's normally best to have an experienced vet remove them. Hope you get it under control. Please update us.