Dstv doesn't understand what free movie means

I wish I could give you negative stars for how you treat me as a customer. Every month I claim the buy 1 get 1 free movie from the rewards app and every month you charge me for 2 movies. In October you've charged me for 3 movies this time. Even charged me for a movie you already charged me for in September. You charged me for a movie I won off the spin amd win. You charged me for October's claimed free movie. I have phoned your call centre. I have used your "let's chat" option 3 times. Nobody has fixed the problem. I wish to cancel my subscription and rather spend my money on a service that doesn't charge me for the things they advertise as free.