ByteDance Machine Learning Research interview questions

Very negative experience. I received the notification about the interview just one day before the scheduled date, but I was unavailable. Tried to email HR to rearrange a date, and received a reply for another very close date. When I asked further about the exact interview time, the HR just disappeared and never reply to me anymore. It's been about a month since the last email. I followed up with three more emails but never received a reply. Overall, it was very unprofessional.