cancellation

I have tried to cancel my contract for 7 months at Telkom. I was advised in Kenilworth Centre Cape Town Telkom that for me to have a data contract i have to cancel my current one. I cancelled it at the store. I cancelled it on the phone confirmed it twice with call centre and 7 months later I'm still on a old contract using a old phone paying the amount of money I could have paid for a new device due to incompetence and breaching of contract of Telkom. I have complained I have emailed Telkom messaged them on Facebook and all I get is we will get back to you. How can you say that when I'm a client . I'm losing money using a old phone where I could have had a new tablet and a better deal. I feel completely violated and feel used by Telkom. How much money should I lose and I expect every cent paid back to me.