Mercedes-Benz Research and Development India interview questions

The HR asked me to come to office for face to face interview. They made me wait there in reception. Then after an hour or two, the interview happened. Then again I was made to wait at reception, they said the HR will come. When HR didn't come, i called him over phone. He said he left for the day ( he didn't even consider to inform / speak to me before leaving ). Then when I called after 2 days for interview result, they have been ghosting me. Such a bad experience. I had to take leave to be present for the interview but they are very unprofessional.