Process for Retake of Revoked AWS Exam.

Hi, This is so unfortunate even after passing my AWS exam, it has been revoked without providing any information about the anomalies found. An simple email from AWS and shattered my all the hard work. In the email, it has been stating that i can retake my exam but only at the Test Center - so just wanted to know, do i need to repay the exam fee? how long can it be booked? and what is the procedure for this?

Thanks!