To summarize everything. It's Tuesday and there is still no reaction from Juniper anywhere.
I've opened a ticket, mail'ed their support address, made a post here and they didn't reply anywhere. I don't have any doubts that they have best network engineers here, but regarding administrative questions they are totally incompetent.
Their letter from Juniper Education Services said "Our team will contact you within 1-2 business days". It was on last Wednesday. My ticket's last activity was 6 days ago. When I created it. I understand that for Juniper 599$ is like literally nothing, but for me it's more than half of my monthly salary. And it's gone. It's like a South Park meme. No one cares. I'm extremely disappointed with their customer treatment.