Deloitte Technical Lead interview questions

There will be first online test, I have cleared Then there will be 2 rounds of technical interview. First round was cleared for me and then 2nd round scheduled. 2nd round was also too good. However they revert me regret to inform you we will not continue your employeement, I am very disappointed as no reason for rejection. I have replied to rejection mail but no response received yet. For each round I got the mail from different HR. So, it's bit difficult to reply every HR to share rejection reason. I have replied to on the 2nd round HR. Just one suggestion, if you don't select no worries - but atleast reply on candidate email. Thanks and wish you good luck for hiring in se position.