I have resigned from company A after working for 20 days. In the offer letter that I had accepted before joining, there was no mention of probation clause (probation period being 3 months)
Now that I have resigned, after continuous follow up for 5 days. I told company that the 5th day is my last day.
But the company has not accepted my resignation and simply ignored it. Now after a week they sent me another offer letter dated in the previous date where they have added the probation clause and mentioned 30 days of employment in probation or recover salary in lieu of notice.
Not only this but informally they are telling me to be on Leave w/o pay which I have rejected informally.
What should I do for this unprofessional behavior?
And how to move on from this point?