Billing me after I asked them to cancel my subcription

Chase Account Number: CH- ********** -1 My subscription was due to end 29/04/2017 and my account was I arrears by R 100 at that time. I received a call from a lady calling from Chase Tracking to pay the amount I owed. I asked her to cancel my subscription and not let the account go over onto a month to month subscription. I also mentioned to her that when I signed up for this service I asked them not to auto-renew the contract when it ended. I paid the amount I owed as per our agreement. 2 months later I receive a call from one of the Chase agents and she asks me to pay as I have missed my payment. I tell her that my account should have been cancelled when it ended and also tell her about the conversation I had with the previous agent months back. She tells me she will investigate and get back to me. She never did but I received yet another call for a gentleman this time telling me I owe money calculated from when my account was supposed to have been cancelled. He tells me he will investigate and get back to me. He never did.

17 November I receive a Final Demand letter from Chase asking me to pay them an amount of R947 . Any amount after the 29/04/2017 should not have been added to my account because I had asked for it not to be renewed when the contract started. Then I also had a telephonic conversation asking that I not be put on a month to month contract.

How is it that I am told there is no record of these conversations with these agents yet they pride themselves in telling me that their calls are recorded for quality purposes.