Be careful when you cancel your service

On the 3rd of December 2018 I contacted the Telkom call center and gave them 30 days notice to cancel my land line and my ADSL line. I was informed that the service will be terminated on 3rd Jan, the next Day (4th December) both were cut off. I contacted the call centre and explained, their response was that I should apply for reconnection and pay the penalty, I didn't. Then to add insult to injury on the 15th of December they charge me for the service I didn't have.