DSTV overcharging

I have a problem with multichoice. On the 22/02/2020 i received a message from DSTV stating that i have to pay a subscription of R448.00 as my payment date was the 24th of each month. i then called on the 24th to change the payment to the 1st of each month as i only able to pay on that date only to find out few day later that i have pay R621.82. Andthe lady who was assisting me did not inform nor alert me that there is charge for changing dates. When i called again i spoke to a guy who didnt how they got to that amount and he was unable to explain how the amount was charged., i then paid my monthly subscription of R400. Today on 10.02.2020 i was disconnected and when i called the lady that i spoke to told me that i have to R180 and i also got a message which i must pay R230.55. I then asked the lady again to the extra charge on my account, she then said it was pro rat a charge of R13.00 a day and she didn't sound convincing, which does not make because the services were on from the 24th to 29 the which is 5 days and i was charged more that R100.00. why is it so hard for their employees to explain such charges if they are legal? And if i was told by the charges i was not gonna change the date on that day, i was gonna wait for the first of the month. The fees do not add up to what i was told today. Day light *******!