Deloitte Software Developer interview questions

I got call through referral for interview in Deloitte.I reached till Managerial Round which was the 3rd round. They took interval of one month for each round, so from 3 months my recruitment was going on. After my Managerial Round it has been 1 month passed away, I didn't receive any mail from them, I sent an email to my POC even he didn't reply. I came to know about my rejection through my Referrer. This is the Recruitment structure of reputed Big Firm and this the second time Deloitte have done this kind of behaviour. They don't have the courtesy to send a formal rejection/ confirmation email to the candidate and that too taking 1-1 month of interval of time for each round.

Pretty straight forward, I had a 30 min behavioral/fit interview, then followed by a 15 min of probability questions/linear regression, and finally had 15 minutes of live coding where they tested basic logic and data structure implementation