Failure by Vodacom to cancel device insurance in spite of numerous requests

Since March 2021 I am struggling to cancel my device insurance on my cellphone with no *** . Vodacom acc No QC120214-5 (Amount R115.43) I phoned in 4 times and each time were told that it had been cancelled but to no avail . Next month the payment still is deducted. Last time I phoned I spoke to a supervisor who informed me that it is now cancelled and that I will be re imbursed for the payments that was deducted after I had cancelled . Not true ! This month the insurance still appears on my bill to be deducted. My phone is included in my household insurance and thus I am currently paying double for insurance. I need this to be cancelled with immediate effect and I want to be re imbursed for insurance deducted after my first call for cancellation in march