They sent me a case study with a deadline of one week, but two days later I received an email telling me that they removed my application from the interview process because they could not reach me at appointed time. I contacted HR and pointed out the error explaining the chronology, but received no response from them. It is still a mystery which appointment they were talking about. I submitted the case study solutions anyway well within the deadline, but of course, heard nothing from them. I wonder what kind of chaos is going on there.