No Comfirmation of Contract being cancelled

Called Vodacom to request a confirmation of the contract I cancelled, was told I must call in very time to confirm the contract been cancelled as they can't give me a confirmation email, I asked for an sms to be sent to confirm, I was told it only gets done once so if I didn't receive it then it must be the network or something ..... All im requesting is a Confirmation that my bill has been paid and my contract cancelled .