Can pvt IT company terminate me for resigning again in 3 weeks?

Hi, I have joined one organisation two months back. However within a month due to work quality i was not happy and searched new job and got offer. I resigned here. Manager accepted it and set last working day within a week. For which I was ok. But I got confused about my decision in this week. I got in dual mind if my decision of leaving so early is correct or not. So I requested manager and HR to give me chance to revoke resignation. First they refused but on my insisting they agreed on very last day. They asked my if I won't do it again in near future they are ok. I said yes to them verbally then. I revoked resignation and resumed service here. However due to the work quality i again getting that feeling of moving out. I still have the other offer. But now I am concerned about how will these people react if I put my resignation again within three weeks . I am ready to serve full notice period again. But I don't want any termination or negative remarks on my profile. I want smooth exit. Please suggest what can be the way outs for me . Am I legally safe to resign again? Can they take any negative action on me? How to handle if they scare me for any such negative action? Please suggest