Hi @Rituparna Das​ 

For sure you will be getting a voucher please wait patiently, if you haven't received the voucher within a few days, please follow the below to get the issue resolved.

For any issue with Academy learning/certifications, you can raise a ticket in the below link, sharing it with you for your future reference as well.

https://help.databricks.com/s/contact-us?ReqType=training

Happy Learning!!