I have been cancelling a cellphone insurance with Vodacom since February 2025

I have been cancelling a cellphone insurance with Vodacom since February 2025. They always promise that it’s cancelled. It is still showing up on the May invoice. I feel ****med by Vodacom especially since I clearly stated that I’m cancelling because I no longer afford to pay for the insurance. The customer care agents keep saying they are escalating the matter, they sent it to the back office etc.