Vodacom sells me fiber when i have LTE

I am extremely disappointed with Vodacom. In March, I received a sales call offering me Fibre, and I clearly indicated that I had recently taken up the LTE router. I was assured that Vodacom would migrate my service from LTE to Fibre. However, I am now being billed for both services, which I cannot afford. I therefore request that the Fibre service be cancelled immediately.