I am working for Accenture in Bangalore. It's been more than two years in the same organization. Recently, I received an offer from a very good company, but they are asking me to join within 40 days. However, in my current company, the notice period is 90 days. I submitted my exit request for 40 days, which is 50 days less than my notice period. I managed to convince my supervisor, DU lead, and project HR representative. They all approved my early release. However, the last approval pending from the case manager (kind of HR) was rejected, stating that the company policy requires a 90-day notice period. I made every effort to convince her, but she didn't agree. There is no dependency on me from the project end, and I explained this as well. I am willing to go for a notice period buyout. Even my terms of employment clause states: "You may at any time terminate your employment by giving the company ninety (90) calendar days prior written notice. Upon providing such notice, approval of any request for early release and/or any kind of waiver will be granted at the sole discretion of the company and will be subject to terms and conditions of the company, including but not limited to the recovery in lieu of notice period not served." I am unsure how to proceed with this. Kindly suggest how I can challenge this decision.