Angry and frustrated

I have a problem with this company someone opened a car insurance under my name in August i consulted Dotsure telling them i never opened that insurance and I don't own a car, i asked them to cancel this thing, of which they said they did but into mu suprise every month i am receiving insufficient debit order notification from my bank telling me dotsure is trying to get money tjis is us happening twice a month every month, i have been calling them to rectify this because it's costing me these R7 that are deducted from my acc because of insufficient funds, and i told them in order for me to change the account i have to pay and i am not working, they always telling me they cancel this policy but this is persistently happening every month.