The campus is closed for Christmas break from 24th-3rd January. So, you may not have heard back from them. In my case I submitted my IELTS score and I submitted an attested copy.
I would recommend you to be submit it via the testing agency as well if it possible(just for the peace of your mind). If that is a problem for you then wait till Jan 3rd for them to reply back to you. This action of yours should not affect your application at all. The attested copy should do the work.
Don’t worry. If they need it, they will ask for it. Have fun! (Feel free to send me a message in Facebook if you if you still have problems)