Urgent: Poor service from Vodacom

I have a contract with vodacom and my sim card that is registered with contract is my secondary sim card. When I wanted to use it this year, the sim was deactivated. I went to a Vodacom store in Prominade mall, somerset west and in Sitari where I was advised that my sim was never activated. For all those months I’ve been paying for a sim card that was never activated on the network. I’m extremely disappointed at Vodacom, I’m expected to pay monthly but my services are not delivered. I need this to be investigated urgently.