Try to access directly one of the files you have uploaded.
If you can access your file like that, then go to your hosting account and using FileManager go to the folder where your sub-domain is pointed and verify if you have in it a file named default.html or something similar and delete that file.
***Signature: -> Do not assume anything! If you want help, explain your problem. If my post helped you, give it a Kudo. If you have the solution, mark the topic as Solved.