Recovering deleted knowledgebase

Hello Youtrack Team, We were working on a project inside our Youtrack and creating Knowledgebase along with that. Recently we delete the project and it has deleted all the knowledgebase along with that project. Can you please restore out knowledge base it is very important to us?? Our Youtrack project is on hosted Youtrack and we are a paid user. Please asist. This is very important, otherwise we will loose months of work. Thanks Om