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Microsoft Certification Program is supported on their own forums. I'd try asking for help with exam scheduling / vouchers in dedicated forums here. (Participate\Ask A Question)
Exams/Exam Registration/General Registration Questions : trainingsupport.microsoft.com/en-us/mcp/forum
Exams /Exam Registration and Scheduling/Scheduling with Pearson Vue : https://home.pearsonvue.com/Test-takers/Customer-service.aspx
Exams / Discounts/Vouchers/Special Offers / Event Offers
Pearson VUE Customer service
Pearson VUE contact / chat : https://home.pearsonvue.com/microsoft/contact
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