Payment Due

My service is suspended, but last month i wanted to pay, it said payment due on 24 September, so when i wanted to pay the R700 that was due but on the 22nd of September when i checked my app it was R1500.00, i though maybe it was a mistake, so i could not afford the R1500, last week Friday on the 20tc October i went to Ackermans & wanted to pay R680 as the day before the app gave me a amount of R671 but when the cashier asked me how much it was R1500.00 So my question now is, the date for payment due is 24 Oct but on the 20th the amount was R1500 again. i do understand that you work on advance payment but why change the amount 4 days before the 24th? DSTV you are losing a lot of clients already because of your high tarifs & now with the amount that change randomly you are also going to lose clients.