Exiger Senior Frontend Developer interview questions

1 HR round 2 technical rounds 1 managerial round. Went through all of the rounds. Interviewers were nice and intellectual. Interviews were average. Overall experience was good. Rejection after all the interview rounds without a reason left a bitter aftertaste. Got all positive response during and after the interviews but for reason they decided to not proceed. After asking over multiple emails still did not get any reason or feedback which was highly unprofessional