Vodacom - Paying for No Service

I have been having a problem with Vodacom ever since I took out a data contract with them in the middle of last year and I have been complaining continuously but they are just not interested in resolving my query but are quick to take my money. I am paying for a service that I am not receiving and it is putting my job at risk. I have to fork out additional money to pay for data because I have to use other service providers. All they can say is "The fault is currently in hand with our fixing department. We however cannot provide a timeframe for a Resolution due to 3rd party involvement " . This is so unfair and this is a RIPOFF!