Hi

Get in touch with the authorities through their email ID or help center. Even after giving a time frame for correction you missed it how are they supposed to help you?. Try getting in touch with them if you are very desperate but since the exam is a few days from today I probably don't think they will respond that soon but still keep trying you may never know miraculously they might get back to you and ask for any solution as it might pose a problem later. Considering its a common error students do they might have a solution or get in touch with the students who had faced similiar problem previously and raised a query here and there are many of them. They are the best people right now who can tell you the outcome. This is the only thing I can think of other than relying on help center.

Let us know how it went.