Vodacom home wifi keeps getting worse. No real action from Vodacom,

Still very slow to no internet. All I am getting from Vodacom are lip service. No real action and no real plan to sort out te probleem. I am paying allot of money every month for a very substandard service. Their competition are doing much better, but I am stuck with a 2 year contract for something I am unable to use. Either the service must get better or I want to be able to cancel my contract.