I joined a company just 3 months ago. My marriage got arranged suddenly and I will be moving abroad with my fiance. When I notified HR of my resignation, they behaved very rude and said they will not accept my resignation. Moreover, they will only grant me 5 days off for my wedding. If the company does not accept my resignation, I will not receive a relieving/experience letter.
What actions can I take to force my company to accept my resignation and receive my relieving letter?