Invisible Technologies Software Engineer Python interview questions

There were 4 rounds, intro, technical, culture and atlast vp rounds. I cleared all the rounds and still didn't get any update from then after a week or so after tons of emails they come back saying we were impressed but regret to inform you are not selected. Be precautions before trying for it. May be referral works I hope. They wasted around a month and half of my time for this. Be alert guys.