As learner we are being abused by Coca cola midrand.

Good day people I work at Coca cola beverages midrand (15 axle road midrand) as learner but ever since we started working from May we are working 6 to 6 which is 12 hours and we didn't agree with them, they forced us to work(6 to 6) when we try to engage with the leaders about this whole thing they don't wanna listen to us, our contract says we are suppose to work 8 hours per day but then we are working 12 hours can anyone please help us we are tired.