Unfair treatment

I have a complaint with Capitec Bank which is a company I used to work for for the past 9 years. I recently resigned due to the fact that I have a new job however I have been mistreated by the company as they are refusing to pay me for the leave days I had prior to that I had spoken to someone in HR who reassured me that I would be compensated as I was not allowed to take any leave during my notice period that I was serving. I have tried to contact HR since the 20th of December regarding my salary which should have included my leave days of which I had 25 of them and I have not received any answers from them. I feel I was ****** and another thing is that i could have taken my leave but I also needed the money for my new start but that was not the case. Please help me get help regarding this issue.