Poor data speed

I have a 2 year lte contract with vodacom. When I took the contract last year November I was getting good speeds and coverage. Now for the past 2 weeks the speed has dropped to just 1meg. I cannot stream on my smart tv and no other device can connect without it buffering. I feel that vodacom has started throttling the speeds from about 830pm. I am beyond disappointed. I want out of this contract.