I resigned from my job in February and sent a notice email. However, I did not specify my last working day. The company's policy requires a 3-month notice period. I asked the company to inform me of my last working day at their discretion. I never requested a shorter notice period and assured them I would provide as much notice as necessary. The company decided that I should work until the end of March. I completed all necessary paperwork by the end of March and finalized the exit process. Unfortunately, my final month's salary has not been paid. Upon requesting my Full and Final (F&F) settlement, the company is now insisting that I should compensate them for not fulfilling the entire notice period. I only have the email in which I submitted my resignation. They have not provided any written acknowledgment and have only communicated verbally. What steps can I take in this situation?