XOS interview questions

Went through a total of six interviews over the course of two weeks. Every communication with them I was told communication is a priority to them. This seemed normal at first during my back and forth with the HR department. After each interview I was candidly told that I was the top candidate and to expect a call shortly. After a week with no communication I emailed them... Another week went by... finally got back to me with “we have filled the position at this time” and that’s the last thing I ever heard from them. Very unprofessional when it comes to ghosting candidates.