From 05 June 2017 now it's the 3rd of October2017 , I cannot get my expired contract CANCELLED

On the 5th of June 2017, I called Telkom telling them that I no longer need my 10 Plus 10 gig contract, and because it had expired, I thought I won't cause me the pain it has caused me for 3 months now. The call center lady said it will take up to 21 days for my contract to be cancelled. I was ok with that, hence when I got my account debited on the 31st of June I thought it will be the last debit order. So I relax.. oh boy! on the 31st of July debit order goes out, now I'm shocked and upset. I call my bank to reverse the amount, I call the call center to tell them that I had sent them the cancellation why is my account being debited? I even told them that I have reversed the debit order. The lady says it will be sorted out, I say ok. The comes August, now they actually tried to debit my account for July and August. I notify their twitter agents, I'm to resend me cancellation ********** , I do that. On the 4th of September I get an SMS that my account is active and I owe Telkom R598. Like this is a joke right? On the 7th I'm told I now owe R897. How? After I'm the one who has been trying to communicate with this people monthly? Now I have airtime I've wasted on these people banks charges I have incurred because of Telkom. I'm so frustrated, I have emailed, tweeted, called.. wasted my time trying to cancel this dam contract. Even today I just called them, they say I must send an email. I just want scream!! REF: ********** 9