After 3 rounds of interviews, numerous "offer is still pending for approval" and "will update the offer next week", HR just fell off the face of the earth!  Keeping me hanging through long stretches of time between communications and updates then failing to deliver on the promised status updates showed a lack of basic professional courtesy. If you have time to respond to feedback, surely you have time for a quick update.

2 video call interviews plus a face to face meeting at the office. The video call were of 30 minutes each and both in English, while the meeting interview lasted one hour and a half.