So guys, further to my previous thread "Resigning at the very peak of a project"

Here are the updates after passing my letter to the HR on 10 March (passed to boss on 4th March)

I would just make it in pointers this time, here's my current situation:

1) Boss is still pestering me to stay back, which I still firmly say no, keep on promising increment and promotion, but not saying how much.
2) To finish up this massive job alone, I practically went to work everyday from 7 March till 15 March (Apart from 14th March), FORCED OT culture is really a nono, no pay, no claims, no meals, losing family time, and bonus amount that don't equate the extra mile
3) Coming end of this week, to meet with HR and partner to have a final persuasion.
4) Boss claim that my resignation notice is not approved yet, assume that one month notice, no matter what, my last day to report duty shall be 10 April right? I will still have to pay back a fine for breaking the bond, I hope that this fine is negotiable
5) Boss claim it is hard to find replacement so asking me to stay back   
6) This company is really squeezing me dry, hate this and will definitely leave on 10th April as shown in the Appointment Letter, 1 month notice of termination.

There is no such thing as non approval of resignation notice right, as I am serving a notice and not seeking permission to resign right? My boss has yet to sign the letter, but my letter has been passed to HR with a follow up email, the 1 month countdown should have begun right?