Hi Lukasz,
Welcome to Q&A Forum; this is a great place to get support, answers, and tips.
Thank you for posting your question; I'll be more than glad to help you out.
There are two answers to your questions:
1.) This forum doesn't support questions about certifications and exams. There is another forum (Microsoft Training Support) for this. Please ask there.
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
2.) If the description of that MVTD does not state anything about a free voucher... you won't get one. Normally, Microsoft only gifts you a voucher for "Fundamentals" and not any higher certifications.
I hope my answer is helpful to you,
Your
Bjoern Peters
If the reply was helpful, please upvote and/or accept it as an answer, as this helps others in the community with similar questions. Thanks!