I work in the mechanical industry. They gave me an offer letter in the mail but did not provide an appointment letter or have me sign any contract. After 6 months, I resigned, giving only an 11-day notice period due to a family medical emergency. Now, the company is withholding my 1-month salary, stating that I must complete the full 1-month notice period. I need my 1-month salary; please advise on how I can obtain it. I do not possess an appointment letter, only an offer letter, and there is no mention of a 1-month notice period. What steps should I take?