So I finished doing a task and then went back on tills. After a while my supervisor comes and asks me why I didn’t do the other task he set me and maybe I have an old man’s memory I told him you didn’t tell me and you probably forgot to tell me but he denies it saying he has good memory to which I said I think my memory is better than yours and he got so angry and started swearing at me in front of customers. I have already resigned what else should I do.