Poor employee treatment and refusing to pay

I am highly disappointed with the poor level of treatment that this company gives to its employees, my name is Mfundo Hlela an ex employee of company at Umhlanga branch, Last year mid November I gave a resignation notice for the 29th of December 2023 and served it fully and did my exit interview with HR and was advised that since I served my notice...they are now refusing to pay me my attendance and leave days,,please assist me with this issue my no. ***