Accenture India — offer letter received

My CID is C8375974.
I had attended interview on 29th November with all rounds on same day.They confirmed on that day itself that I had cleared all rounds and status also got changed.I uploaded the documents as they were in a hurry for it.Now the status has changed to'Owing to business reasons we foresee some delay in processing your candidature...'and so on.
I contacted concerned Talent coach on
call and also dropped many mails but till yet didn't get any response.
It's very disappointing that people from well know MNC treats applicants/candidates in such a manner.
Earlier in Aug 2019 they called me for interview and cancelled it after I reach there.
Please understand that we are also taking leaves and investing our time in it.
Kindly look into the issue and let me know what needs to be done.
Thanks