Data Contract

I have an existing 3g contract with Vodacom. I was supposed to receive notification about the expiry so that I would have had the option to renew or no. no notification was received and they started debiting me R345 per month- Was a mission getting hold of them - they renewed and said re took all my details again so that they can notify me telephonically and via email- nothing was done-. when I managed to eventually to get through to the various consultant's, they are so confused all giving different stories and one even said I must pay the arears , but there is no breakdown how they came to that figure- she also said it will take 24 - 48 hours t send the statement- nothing has been received yet after 48 hrs. it is lies upon lies- will definitely not renew- they don't even deserve a star