VODACOM FIBRE SUCKS THEY DONT CARE

I am disgusted by the service I am getting from Vodacom. The speed is too low, I was on 50mbps and upgraded my speed to 100mbps still no imprbovement of my speed. I am on the verge of loosing my Job, I work from home I need internet its been 3 weeks of calling no results. Why am I paying for the speed that I am not receiving Ref No SR*** SR*** I cant cancel my contract cause I don't have money to pay for the remainder of the contract. IF YOU CANT PROVIDE THE SERVICE RELEASE ME FROM THE CONTRACT