Cell C call centre *****

I worked at Cell C as a call centre agent selling hisense mobile phones and even posted a bad review about Hisense but Cell c was to blame for not issuing the incentive card after months of going back and forth with Cell c and Hisense, I received a card from Hisense but Cell c didn't pay me out what was due to me. I know that I had R900 owed to me but Cell c claim it was R600. I feel that some ********** behavior was done by Cell c because firstly it showed I was issued the card and spent it in Pretoria but I currently live in Durban and the money they have paid out is R300 short.