Unresolved cancellation

I cancelled a contract and returned the device in August 2016. Telkom Mobile was still billing me and I put a freeze on their payments on my Bank Account. I was handed over to Nudebt for a device I sent back to Telkom. So I don't know what I should be paying for. If your employees did their work properly...... My contract would have been cancelled, the device that only God know where it ended up would be in your possession and I wouldn't be so frustrated that I'm at the end of my rope. I will never, ever, ever, ever take out a contract with Telkom Mobile. And I'm sure my credit profile is so *** that I probably have to fight to get that right after Telkom Mobile decides to sort out my cancellation. And this has been going on for 1 year now. So.... Thank you for nothing Telkom Mobile.