Vodacom insurance charged for 3months **********ly

In June 2020 I cancelled my insurance plan with vodacom, and my cell fone was already on prepaid, then in August 2020 took a data plan with them. So in December 2020 out of the blue vodacom sent me an invoice with insurance being charged and when I contacted to explain that I no longer have insurance with them, they told me it was system error but they can't reverse the Insurance money since it was on the invoice, but insteaat they will deduct it then reverse it back to me, and they will see to it to cancel the insurance that was activated by their system mistakenly.. Then I continued communicating with them almost every 3days of the week, because now even in January 2021 they still charged me for insurance, until February 2021. Contacted them again, and still not resolved, then decided to dispute the debit order, so that nothing can be debited from my account. Then all of a sudden I received a call today telling me I owe them money for data plan, whereas they stopped my data plan and they still owe me money for the insurance that was charged for 3months **********ly... So even today am still waiting on them to resolve the issue, but they keep referring me from one person to the other and nothing happens.