Cancellation of contract phones

I am fairly disappointed with the service i received from telkom mobile as i am angry with the way they treated me i logged a query and a dispute as i had send a cancellation of my contract with them beforw my phone contract was about to end, as they had advise on their terms and conditions that i should send a cancellation a month before my contract ends. The funny part is that they kept on debiting my account while i had send a cancellation and i went to deferent branches Maponya and Trade route i even called their call centre but still nothing happend. Now it seems like they closed the account but on berau it say i defaulted their payments. Please sort this out. I still love telkom but i feel the love and friendship i had with telkom is fading away. I send a cancellation to ********** and ********** on the 11 September 2017 and ********** on the 23 March 2018