Vodacom Insurance - Useless

In February this year I have called Vodacom insurance to cancel my insurance policy. The premium as quite steep, as it was 25% of my subscription payment each month. I was told that this would be cancelled and as of March I would not be billed for insurance. Not only did they lie to me by still charging me for the insurance in March, I can see that it is already on my invoice for April. This means that another month will go by in which they will take the money for the insurance despite me cancelling. I am highly upset, as I feel that I am being ******. I have tried several times to contact Vodacom insurance, but it is painstaking to get hold of an agent. After holding on for what seems like an eternity, the call just drops. I am highly frustrated and upset about this.