Request to cancel contract and change to Pre-Paid, still not done?!

I have phoned Vodacom customer care to cancel my contract and have requested them to be changed to Pre-paid as we are relocating to Canada on the 2nd of April 2021 and won't be needing this service anymore. This request was made before the end of February 2021. You receive this long reference number but when making follow ups it seems the staff can't assist??? The 2nd guy I phoned could not find my 1st reference number or my enquiry when phoning in March and gave me another reference number. The 3rd time I have phoned the staff member I have spoken to has said that the necessary changes was made and that an email would been send to my email address confirming that the changes was made - no email has been received since my request. NO response has been received before end March, I had to phone yet again and the gentleman I have spoken to 2 days before flying and stressed out has confirmed that the system was updated that I'm on Pre-paid. I thought all was good to go. The last DT order will be deducted from my bank account on 1st of May 2021. On the 1st of June 2021 another DT has been deducted?? Why are you *****ing my money??? I have send numerous emails in the last 2 weeks enquiring about the DT order and confirmed that we are not in SOUTH AFRICA, no feedback has been received from your *** to assist. This is poor customer service!! I have been with Vodacom for almost 20 years if not longer and this is how you treat your clients!!! I need a refund of my DT which was deducted from my account A.S.A.P. It seems that your staff is only doing as they want to and do as per request from your customers. I'm staying in Canada for more than 2 months already and did not made use of Vodacom as here is not signal, how can you still deduct money from my account if my contract was supposed to come a end by END OF APRIL 2021????? I'm waiting on feedback from your Management. Unhappy customer Diana from Canada