Correct cancelation process not followed

I had a contact with Vodacom and on the 18th February 2019. I called to cancel my contact as my 24 months was up. They canceled my contact and ,I asked the agent will there be a debit order in March as I already paid the 1st of February ? The agent put me on hold to double check and informed me that there will be no debit order for this cancelled contact. I received a "reminder" sms that my account will be debited on the 1st March 2019 .I called the call center and requested the manager to listen to the recording of the 18th February as I called from my number (the cancelled contact number) to my surprise the agent that I spoke with on Tuesday 26TH February 2019 never send the request to the manager. This is very ********* and unprofessional service from Vodacom. I was a customer and now I have to pay for a contact that is canceled. I want feedback and why I was told that there will be no debit order when I canceled the contact.