Not getting acceptance of resignation from government department

I am working with delhi govt in a permanent job but in probation period. I tender my technical resignation from the present post to join in a job under central govt three and half months back.. I need to give one month prior notice under rule 5 (1) of CCS ( temporary service) rules, 1965 as mentioned in my offer letter. I applied for the post through proper channel. The last date of joining in new job was in January but till now I have not got acceptance letter from authority. Whether I can leave the present job just like that or I need to wait for relieving order.