Capgemini Associate Consultant interview questions

It was really smooth interview process. 1st round was telephonic and 2nd round was F2F interview 3rd round was HR discussion Offer got released on the next day of interview All over it's a smooth process

I have attended interview in the month of July 2017. There were 4 rounds of interview. 3 technical + 1 HR. After clearing of all rounds and Salary negotiation. Offer letter is never released till now and reason told by them that I am having 90 days of notice period although it was clearly specified by me prior to the interview process.HR talks in a very rude way. Very disappointed by their behavior.