Cancellation Problems

I got a new contract from Vodacom after a consultant informed me of all the benefits I would receive from this contract. After activating the contract and receiving the device, the benefits confirmed as per the telephone recording was not true. I singed up for a data contract whereby I was told my monthly instalment would not change and that the data was transferable. This was not the case and I cancelled within 14 working days as advised. I went on the myVodacom app and saw that the contract had in fact not been cancelled and that I was going to be billed for a device that was said to be cancelled and that was collected and sent back to Vodacom by the courier. I never used the device and know Vodacom expects me to pay for a device not used. This is not the first time I have had issues with Vodacom and will be looking at moving all my contracts to a new provider. I comp**** with everything as stipulated by Vodacom within the cancellation period and the device was already sent back in July. This is August already and the contract has still not been cancelled.