My manager is pressurising me to put resignation

Hi , I was been hired for the role of cloud engineer in IBM on November 9th 2021. But was not given the work of cloud engineer . Since there were no such project I was forced to work on different skills which were of non technical . Since I was newly joined I accepted it and worked . After 3 years now , project got completed . I’m in bench period from 2+ month now and now my manager is saying IBM is not having any projects so put down the papers . There are many people like me who got out of project and still in bench for 3 months now but their managers are not torturing them to put papers . But I’m been done like that . For accepting this non technical work now I’m been not getting projects outside as well . If I inform this to my manager he says what to do . U put paper and stay in notice period for 90 days and leave the company . Then I got project which is 50% billable project so I informed to my manager he said accept that project and put papers don’t inform project team that u have put papers . I felt it’s not fair to put papers . The same thing should be applied to other employees as well but they are not . I’m getting mental harshment for putting the papers continuously . What to do in this case .