No acknowledgement of notice to cancel.

I have now called Vodacom numerous times to give notice to cancel my contract. I finally got to speak to a consultant and was assured I would get an email and sms to confirm my notice to cancel. I have received neither. Reginald, the consultant was more worried about me giving him a 5 star review than to even give me a reference number. I know this is how cellphone networks weasel themselves out of cancellations and deducting for longer than they should. I need an acknowledgement that my contract will be cancelled when it expires next month.