Resignation

Hi, I have notice period of 3 months. I have resigned on 15th Feb 2018 due to the work pressure. I had discussed with manager and TL multiple time about the work and requested helping hand for the process which I'm handling, the reply from management 'will try to provide resources soon' but no improvement until I put down the paper. After 3 weeks from the date of resignation, management came with resources. Earlier, there was no reply for my resignation email and on 9th I had retract my resignation and there was no reply again from manager either HR. I had retract my resignation because the management had provided helping hand and the process was smooth. On The time I had put down the paper, the manager spoke to me to take back the paper, the discussion was continue for 2 weeks and i told the management that i need solution untill then i will not take back. But on 16th April 2018, 5mins before leaving the office after my shift, my manager, Tl and HR called me and said that they except my resignation which I sent on 15th Feb 2018. Kindly advice me what I should do next. I felt this is unfair and not professionalism at all. I am working as language expert - Accounts Receivable in india. Female employee.