Unable to use multiple vouchers in one order - lack of any response from the shop

For this, attend the community talk that will take place on April 23 and ask your question there quickly; unfortunately, you have no other choice. Mine also wasn’t answered for 1 month, believe me, I was uncomfortable with this situation too, but anyway, luckily they’re organizing a meeting. Until that day comes, you write your problems in advance, and when you’re there at the meeting time that official both answers them and you can also ask additional related questions and get your answers.