Contract Cancellation

In January 2015 I had a contract with Vodacom, which I cancelled in January 2016 . 10 months later I received statements that I'm owing. I called the customer centre countless times they all tell me I'm still owing and that's there now they have taken my account to the lawyers. On 8 September 2017 I drove all the way from Vosloorus to Midrand head office in the Vodacom shop next to Samsung and Huawei and was assisted by Londiwe Ngema, she said the query will take up to 7 days, now 7 days has elapsed and there is no feedback. I went to Midrand because no one was able to assist over the phone, they keep on transferring you from one consultant to the other. Can you imagine the amount of fuel I used, I have sent her emails and there isn't any replies. I can't even apply for credit because they have messed up my credit score. I am very dissatisfied with the level of service because these consultants don't seem to know their job. First it was the person that was suppose to cancel my contract which they didn't now this.