Failed cancellation of my account after three cancelling payments

I have had it with Telkom's useless customer service 2016 when.I had to cancel and pay three different 'outstanding amounts'. Each time I asked someone different I got a complete different amount (Incredible!) So begrudgingly I paid two more times and then two more different people told me I owe R60 and R400! I went into the store to complain and give them dates of payment but they Saud they don't do any payments or queries of accounts in store???? I need to phone. I did and each time they said they would get back to me. I mailed a person that I was talking to all the proof of payments but no response. I left it. (There are no debit orders on my account) Yet today 16 November 2018 out of NOWHERE, no correspondence since 2016 I am am see and threatened with cancellation of my account and attorneys if I don't pay the amount of R11 114,90. REALLY? There is just NO WORDS for this shocking 'business'. No customer service, occasional empty promise when you still active them and no follow up or accurate data on their systems whatsoever! STAY FAR, FAR AWAY!