HELP uk study visa ( missing document )

After doing my biometrics I was checking the uploaded documents and a very critical document ( my dad permission / sponsor letter ) was not uploaded

I sent an inquiry and I’m waiting to hear back from them. I tried to call but nothing

Do you think they’ll just refuse it? Or will they reach out what more slightly to happen? I’m very stressed out.

All the financial evidence are his properties and bank statements

Please help if there is anyway, or anyone went through this or have heard about something similar