HCL Technologies — I'm complaining about my Onboarding

This is Loganayagi S. Hope you are doing well I recently passed out(2022) in Sathyabama institute of science and technology. I got placed in HCL tech in nov 2021 in my campus recruitment. I didn't get my offer letter and joining date yet . My Onboarding HR is Supriya Shankar. Someone called me who's name is Johnson on March 15 and ask whether the Noida location is okey for me or not. I said I'm okey location Noida. But after that I didn't get any update. I called to that number but he didn't pick my call and he declined my call.I ask my Onboarding HR regarding this, she said wait for some time. But it's been a month still I didn't get. I'm clueless, so please clarify me when will I suppose to be Onboard. Give any tentative date of joining. Kindly do the needful as soon as possible.
Thanks & Regards