Poor service and no communication completely

Been trying to cancel my Absa Activate short term insurance for the past two months as I was fed up with their poor service of not being able to answer simple queries nor to pick up the phone for that matter. It got one thinking if I had an emergency or a claim how would I have been assisted. They refuse to acknowledge my policy cancelation and I want nothing to do with them. I stopped their debit order and they keep changing the debit order date to get around it which to me in my opinion is *****.