Nightmare after sales service - still refusing to cancel my contract

I sent my initial complaint on 12 January 2018, because of Telkom's long delay and bad service in cancelling my contract since 2017. Well it doesn't end there. I received a reply to contact them back and sent my cancellation letter/email trail to them. I also paid my cancellation fee. And then of course I thought everything is sorted. Well I was mistaken. Suddenly on August they decide to deduct R1500.00 from my bank account without my consent. I was luckily able to reverse that. They then did not deduct in September so I thought its sorted. Well today I get an email that my account that should have been cancelled in January 2018 has been suspended. The message I received was " Your account for customer ********** 96 has been suspended due to Collection" I am very upset as this can impact my credit record negatively. I need someone to sort this out asap, unless Telkom wants to continue this into 2019!