I did not believe when I read your story that there are still people using this platform, and that the platform is still active at all. Hitbtc was one of the most famous platforms and was known for its suspicious activities without any interest from its management in establishing a good reputation. I remember once reading that they could list any new currency for a fee for a certain period without verifying the integrity conditions of its project, meaning that Hitbtc was benefiting from scammers' help in listing worthless currencies.
I am sorry to inform you that your chances of recovering your savings are very weak because no one has the authority to influence Hitbtc if support stops communicating with you. You should have done your research before choosing where to put your savings.