Unauthorized debit order by Shaw Academy

Shaw Academy is a ****. I will not recommend it to anyone. I was told that I can take the whole year to complete the course but i was charged R399, what frustrates me is that i canceled their membership but i was charged R399 and they take it as a purchase so that the bank won't be able to reverse it. I want nothing to do with them i just want my money back. They must go back to their calls and listen to their staff member telling me that i won't be charged