[Resolved]  Capgemini — HR not responding on Joining date Issue

I got selected in Capgemini & received offer letter from them, but the date of joining was mentioned as after 30 days. During the HR discussion I have clearly mentioned that my current company has a notice period of 3 months, also at the time of document submission I have mentioned my current company notice period in my documents. I mailed my reporting HR regarding this but even after multiple mails & reminders I did not received any kind of response from their side. I even called her on phone but she straight out disconnected my call. After this I mailed to CG_INTERVIEW_HELPDESK @capgemini regarding the same but still no response from them.
It's been 3 weeks that I have mailed regarding my issue but not a single person have bothered to replied me or tried to solve my issue. This kind o[censored]nprofessional behavior is totally not acceptable from a renown company like Capgemini .