Taking money not due to you. (*****???)

Showmax just randomly decides they need more income so they use my credit card details they have "securely saved" to debit my account for a service I did not request. After ages on hold and then on your helpline I am told you cannot refund but it won't happen again. (looking at the other messages here I clearly should not believe you.) When I request a superior I get cut off, hats off on customer service." HOW ARE WE GOING TO RESOLVE THIS? You have forced me to go public by not teaching your service agents how to deal with your mistakes, intentional or not.