if you really was wrongfully vacbanned, there's nothing you can do... just wait, their system is automatic. Valve support wont answer you properly and the valve employes cant help you.
if you doubt i was realy vac banned:
the final e-mail i receive from vitaliy <3
Our system is fully automatic, and I’m glad to hear that your infraction has been successfully removed (and our apologies for the error in the system in the first place).
As the note at the bottom of this article says [https://support.steampowered.com/kb_article.php?ref=1203-WJCV-7019]
“If a round of VAC bans determined to have been issued incorrectly, they will be automatically reversed by our servers.”
We audit all waves and automatically reverse the mistakes for the affected accounts.
My ban was reversed within a week
Sorry for my favela english and good luck!