No body can stop you once you prepared ur mind to leave.
1. employer doesnt have any right to stop you
2. You can ask help with the labour dept , 100 percent they will help you
3. You can kick on the A** of your boss or any seniour management guy, so you dnt need to put up ur efforts to go for the labour dept.
4. keep a e conversation for the same as a proof.

All the best and very best wishes...