All right guys, Vitaliy contacted me using private message on this forum. Obviously, he read about what I have written recently.
Technically it was not their fault, because I summited multiple orders without notifying them. (I finally decided to go for V6S instead of V3)
As a result, my impressions were attached to an abandon V3 order instead of my newer V6S order.
Therefore, they couldn't find any impressions were supposed to use for my V6S.
I have to make public retractions of past statements, their customer service is surprisingly well indeed.
Because I didn't expect Vitaliy would contact me in advance, he also promise me to expedite my order so that I could received them on schedule.