My colleague Tanya served a 15 day notice period, instead of a 30 day, her organization stated that this is not allowed, in spite of her compensating them for it, and they have ceased her relieving letter, and considered her case absconding in spite of her telling them in advance and leaving the company, she had mentioned this on her mail while she sent her resignation, she needed to get married and relocate, please advise what course of action does she need to take?