Vodacom blocking my number

My phone is about to expire I phoned Vodacom call centre to give a notice. After the call the person who was assisting me never sent me a confirmation of my request of cancellation. On the following day I phone Vodacom to follow up so that I can get a confirmation of my notice of cancellation. To my horror every time I phone Vodacom call centre I get an automated response that my number has been blocked on the Vodacom system because they suspect ***** due to high volume of my calls. Now my contract will continue from month to month because clearly whoever was assisting me to cancel was *********** and when I want to follow this up Vodacom blocks me from speaking to one of their customer service. This is horrible and quite frustrating to say the list!