Vodacom makes it hard to cancel contracts

I've tried to cancel 2 of my numbers. I got a quote to settle them, I signed them and sent to vodacom to confirm I accept, they have no banking details on.. It's a month later after signing and I still have the contract and everytime I ask vodacom to cancel they ignore me and keep sending me authenticarion emails. I got an email to say my case was resolved and closed but it's not been resolved. Its so hard to cancel this.. Contract ends December, I now want vodacom to cancel this free of charge as the amou t of time I have spent trying to fight them to close this has been a mission.. They are extremely quick to sign you on. Don't be fooled how hard it will be to cancel