Name Change in certification account

Hi team, I want to change my last name in the account because in my government ID there is no last name so because of that I was not able to attend the exam last time: Candidate Id : AWS*******

Current first and last name is First name: S********** Last name: S

Updated first name and last name: First name: S****** Last name: .

I have raised requested more than 10 times in this link (https://support.aws.amazon.com/#/contacts/aws-training) but still no response my next exam days are nearing so where should I raise request for this.