Very unhappy client

In November last year I was phoned by Vodacom to upgrade. I then requested to cancel 4 numbers (2 extra numbers & 2 ****les). In December they phoned me twice & I told them both times that I had requested numbers to be cancelled. In January they phoned again & the numbers were still not cancelled as per my request. Finally during January 3 of the 4 numbers were cancelled. It is now AUGUST & the 4th number has still not been cancelled & I have been charged for this every month. A month ago Vodacom phoned again & I complained & the guy said he would phone me back...still nothing! I want this number cancelled immediately & I want a full refund of monies deducted. Go listen to your so called "calls are recorded!". Disgusting service!