Billed after subscription cancellation

Last month I cancelled my subscription and as this has happened to me before with Showmax I made sure I made no funds available for them to deduct for a week because they never send cancellation emails which they use as an excuse for not wanting to refund your money after cancellation. Yesterday the deducted money from my account after I had cancelled today I spoke to a lady by the name of Lerato who in no way was eager to assist me she turned down all my requests without any consideration, she refused to give me her surname or even her supervisors details. She went as far as ending the live chat while I was still trying to get help.