Not paying for Telkom’s mistake!

I had a contract with Telkom. The contract ended in October 2020. I cancelled any further services on 2 July 2020 as I had decided to use a different provider. The website says cancellation can take up to two months. I cancelled 3 months before. I receive a statement in. December I owe them 2months money I heard this from duke not Telkom. So it had escalated already. I contacted duke and Telkom with proof that I had cancelled the service on the second of July. I didn’t hear anything back. Untill now from another credit company. And now the account has gone up. Telkom sort your stuff out!