Northbury Park Secondary school in PMB

I took an SGB post for IsiZulu and Life orientation at Northbury park secondary school. 2 weeks later I am asked to teach geography which is no my major subject and I have never even done it in hight school. So the principal terminated my contract and said i will be in school until end of term and i will receive my salary of 8000 but i only received today 5400 with no explanation. I am so angry and feel used plus i resigned from my previous work hoping for a better career at Northbury Park. I am so angry and disappointed at the principal she uses people for her own gain