My story is as below:

I worked under a company for 1 year,but due to some reason my boss ask me to resign because he know that I'm planning to leave already. He verbally say I can leave / resign immediately within 24 hours and will clear my wages and commission until the last day of my service for the company, I pass my resignation letter on the same day and done my handover to him, when I pass to him he said ok but then he never sign my resignation letter or anything in black and white stated that about my resignation within 24hours. The catch is until now I also not yet get any payout from them and they even send me a letter stated that I need to pay a sum of money for 3 months of salary because I didn't serve for 3 months in order to resign. Can someone pls help me how do I deal with this? So upset now