Trending @Cognizant; No Project work and notice period

I am Programme analyst I got allocated to a project in SAP BW they told first me to wait then they told me that you are wrongly allocated into the project so they can't onboard me I am not even getting released from the project as HR cancelling my release request as 18 months rule what to do now any suggestions One more question If I resigned how many months I have to serve the notice period