Moisture in an exposed port LMAO. I would phone Samsung and complain about the company.
Hopefully you removed all your personal data before you sent the phone in right (like pictures, email accounts etc etc.)
I have complained to Samsung, they are backing the repair company too.
It's a joke. I'm even willing to pay a smaller fee to just repair the EFS corruption and have no warranty going forwards but they "cannot" do this. But I'm not willing to pay £55 for a external port issue which COULD NOT have caused the corruption - the service centre even confirmed that the corruption was not caused by the moisture.