Served resignation letter within probation period

Hello, I have recently joined a co. with 6 month of probation period and 3 months notice period which can be partially or wholly be taken off by the company. At the moment within 2 week of my employment I felt I was unfit and hence I resigned. I don't have any project, or any work to be done. I have served a resignation letter on March 15, 2024 asking to be relieved on 1st April, 2024. I have initiated resignation on company portal as well. The manager has asked HR to not proceed at the moment and want to speak to me, however we have had previous discussion on separation and I told him I am not feeling to move ahead. Since I am on probation with no work, can he still force me to work for 3 months? I have no desire to proceed with working. Also, the new co doesn't need any relieving letter from this employer as there offer came after I joined this co and I worked here for only 2 week. I wish to submit my IT assets by April 4-5 max and get over with the co even if they don't give me relieve. Kindly help me. Let me know.