In my current employment, I have signed a contract for a 2-month notice period pay 8 years ago in 2012. The company is now requiring a 3-month notice pay. However, since I have only signed a contract for a 2-month notice period and have not agreed to a longer notice period after that, I am unsure which notice period I should adhere to. Should I serve a 2-month notice period or a 3-month notice period?