Brillio Machine Learning Engineer interview questions

I had a very devastating and pathetic experience with the hiring process. It took more than 2.5 weeks to complete. The assigned HR was ignorant and lacked responsibility. I have to call, and text her multiple times a day to get an update every time. There were 3 rounds and after successfully completing those rounds they took 2.5 weeks to respond with their final decision. Throughout these days, HR kept on saying it takes time for the approval . On the last day too at 2 pm when I called she said have patience it takes time for approval and after waiting for 2 hrs , I suddenly received an email from HR that they are not proceeding ahead and the position has been put on hold. This is unprofessionalism. How all of a sudden the position got on hold. If the position is not active then why do you guys reach out to candidates? Don't consider applying to this organisation, they are not worth it. They only waste time and effort especially the HR.