Appalling service !!!

On 26 April an agent called to renew my Vodacom contract. On the same day I called them back to cancel the order. I have subsequently called them 4 times to follow up on the cancellation. On 30 April call centre agent Veronica confirmed that the contract would be cancelled the same day. I followed up again with Vodacom today (1 May ) and elite mobile has still not cancelled this contract preventing me from upgrading my package to a preferred one at Vodacom. This needs to be resolved urgently. Appalling service!!!