Vodacom - a Bully in my opinion - taking money for a product cancelled.

I have been a Vodacom client since cell phones became available. I have upgraded many times over the years. Received notification that I can upgrade almost two years ago and went into Vocam Shop in the Vaal Mall as I did all the years before. Upgraded to a new package with two phone sets and was told that for two months I will pay extra to finish my existing contract - which I did. I recently queried my account that seemed too high at Vodacom Vaal Mall and was treated like dirt when they realized that my previous product was never cancelled. Even the manager just said sorry we do not cancel agreements you had to do it on your own. I phoned from the shop that day but it seems it was never done. I have been Phoning Vodacom on the cancellation line *** (old BBM number from black berry days) to cancel this contract and twice I was promised that they will cancel it last month and the manager will make sure it is done and they will investigate to do a refund for me on a product cancelled with my upgrade. I just got my second bill after I cancelled this product with Vodacom this year and still billed for a product never used in almost two years. Shame on you Vodacom for being bullies that respond so slow to clients and just keep on taking our money and if someone don't pay you simple black list them - I call that a bully. Maybe time to move away from Vodacom with all my personal and business products.