UBS Tech Quality And Test Engineer interview questions

I have given hackerrank test and after a 20 days, my interview got scheduled for a date which is 12 days away from the day I received invite. Then day arrived, I was waiting for an interviewer or HR in the call for around 15-20 min, but nobody showed up. I mailed details to the HR and again no response. after few days later I have taken follow up on the email, HR replied, appreciate your patience and I will update you till tomorrow. but as no surprise, again no updates or a call from HR. this is ridiculous from UBS HR and technical panel as well. they dont respect candidate or people apart from UBS.