Disputed Cancellation

On the 21st June, I called Cartrack and spoke to one of your agents. This was regards to cancellation of service. The agent assured me that my relationship with Cartrack was done and my account will no longer be debited. Monday the 19 July, debit order went through and I immediately cancelled. The following day I got an email reminding me to pay for my account. I then called Cartrack today but the call was cut because of airtime. I tried explaining to the agent that as far as I am concerned I had no relationship with Cartrack. I asked her to pull the conversation transcript from 21 June where I asked several times for confirmation that there will be no debit order on my account from Cartrack. Unfortunately the call cu where we were exchanging a very heated argument as she was sending me to the creditors for the transcript while I was telling her that the transcript was for the use of Cartrack to confirm the details from 21 June with the agent. I want nothing to do with Cartrack and was given assurance that you will no longer debit my account anymore. Could it please just stay like that and delete me from your system.