PDX interview questions

I applied last February, had the technical interview online with a panel. Typical QA questions. Then never heard from them until September. They message me for a final interview. Then during the scheduled time they just said it was cancelled without explaining anything. I waited for a communication via sms or email for a reschedule or notice, but none. Maybe they found someone better to interview at that time. They should not be wasting applicant's time.