I resigned from my company last month, and my last working day was at the end of last month. The usual notice period is 3 months, but they gave me an early release. I hadn't been to the company since the last week of March as the company was functioning with minimal manpower. They started asking people to return to duty from the beginning of last month. They had asked me for my tentative return date. Due to the COVID situation, I mentioned that it would take me approximately 2 months to join back. However, the company has asked me to buy out the months from the end of March to the end of May for 2 months. Considering the COVID situation, can I go back and ask them to extend my notice period for the full 3 months?