Hi. I completely understand you and I’m hoping that the process may go faster. Try calling whatever support number you can find. I do not have one handy unfortunately. See if you can get it resolved on the phone.
In the worst case scenario, you can reschedule your date for next week sometime unless you are taking it at the test center and there are no spots. However, changing your appointment at this point in time is going to be expensive.
PS. You can take the test all the way until the day of your submission and as long as you have the score that you can put into your application, it works. So you could take the test the day before the deadline though I do not recommend that 😇