At first they inform you that the advance you've paid wasn't booked on their bank account and that you have to pay it again. Luckily, our case was solved after we contacted the Hostelclub staff. I think that they are frauds who hope that the clients will give up because of their language incompetence, not having the ability to contact the Hostelsclub staff or simply the clients don't want to cause themselves any additional problems during their holidays.