Another billing bungle.. so disappointing

I’m really getting tired of Dstv’s billing system. I deposited total of R75 onto my Dstv account to use for Box office rentals. I have since rented 3 movies , but my account balance displayed on my app has increased by R75 from the amount shown before I my initial deposit. The strange thing is that my payments totaling to the R75 are showing on the transactions list. Even before that, the amount that was supposed to debited from account was about R594, after the credits to correct previous billing errors, but R644 was debited., now this R75. . What went wrong with your billing? This is so tiring, please please fix this. It’s really disappointing.