Hi Taisiya,
Please ask your question in the Microsoft Credentials forum using link below.
There are support moderators over there that will respond to your question in 1 business day and can help with voucher related questions. They are the ones that can potentially issue you a new voucher:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
Additionally, you can register for and attend one of the Microsoft Virtual Training Days events and you will receive a voucher by email within 5 business days after the event and that will give you 50% discount. On the Microsoft Fabric event it says the discount is for Data Fundamentals exam, but according to the FAQ it will work for DP-600.
Please click Accept Answer and upvote if above was helpful.
Thanks.
-TP