Paying for services not received

In July I was contacted by Vodacom Rewards Department so offer me a router. I informed the sales agent I already have a router and was told this is smaller than the one I have so I can carry it in my pocket. Was also assured that if I cancel the router before activation they will collect it, no charge. On the 19th of August, within 7 days of receiving the router, I phoned Vodacom to cancel the router. I spoke to Njaleng on the 19th of August at 09h42 and was assured it is cancelled and the router will be cancelled. When asked for reference number was told the reference number is her name and date and time of the call. On the 26th of August, I phoned again to cancel as the router still showed active on my account Spoke to Lesego who assured me she will cancel the router. The router was collected on the 28 August by RAM Couriers. On the 10th of Septeber I phoned again, after being billed for the router and spoke to Bryan. This time I was given a reference number. S3-8GY2V-VL06B. Again was assured it is cancelled. Spoke to the the cancellations department again today and was told they can not cancel it, it must be cancelled by the rewards department. no success after 10 min wait.