The word "unprofessional" comes to mind.
Their recruiter is the only person that I actually liked and also feel extremely bad for as the hiring managers put her in a horrible position. After going through two rounds of interviews, my third is scheduled and the person no-showed me and asked to reschedule. After many attempts to do so, they then informed me it was no longer available. In all honesty, I will never apply to work here again if this is how they treat people. In my opinion, there are far better places to land than this.