What’s the worst interview process experience you had so far?

I recently applied to Indian Fintech, first round went well. Got no response from HR for 3-4 days. Once I called her on 5th day, she told me that I had cleared first round and they will assignment next day. Assignment didn’t arrive for 2 more days. HR stopped picking my calls. After this I reached out to third party recruiter (who started the process initially). She contacted this company HR and they sent me assignment next day.

I had to complete it in 48 hour strict timeline. Spent entire 2 days on it and barely slept. I submitted it on time.

After this no reply from HR for 4 days. Finally I reached out to my interviewer from first round for help. He said he will remind HR.

Next day I got call from HR that all open positions are closed and we will consider u in future. No feedback on assignment was given. Not even sorry for making u wait.

Isn’t the only thing HRs need to be good at is people handling & professional communication?