I resigned from my current job on 5th Feb, 2016.
I have a notice period of 3 months in my contract, but I asked my manager if I could be released early and he came up with 2 dates, saying "Is there a chance you could work till 25th March or 18th March (ideally 25th)? That extra two weeks would give me time this week to vet CVs and interview people as they will have a months’ notice minimum, it will provide vital overlap. We would want a handover with yourself before you leave."
To which I replied saying I would prefer to be released by 18th.
Based on this conversation I conveyed to my new employer that I can join from 29th March. But now, my current manager has changed his mind, as he is not able to find a replacement. he wants me to work till my notice period saying he never officially replied to my email confirming a date and he mentioned 25th as a tentative date.
Is there anything I can do to get the company to honor the 25th as my final day?