Unnecessary payments

Good Evening, i would like assistance in this matter. I have not been able to pay Rain subscription for months due to financial problems im facing. About last week i received a call and SMS from them telling me that i should log in into my account as they have prepared a payment arrangement for me. On the 21st of January 2022 i then logged in and found that i have an outstanding amount of R275.00 which i can pay from R100 as part of payment in order to reactivate my services. R100 was then paid and just month end they debited R175 which i understand it is from the outstanding they said previously. Few minutes later they debit another R72 which i dont understand for what??? Because as per my knowledge Rain is a "pay as use" contract and dont accumulate arrears. So that means all in all for a period of a week and a half i have so far paid Rain R347??? How is that possible whereas my monthly subscription is supposed to be R250 and it cannot be R250 because i have only used their services for a week and a half. Again R250 will be debited month end of February for another payment??? I would gently ask the extra R72 to sent back into my account because i dont understand what is it for. And they knew it wont even notify me as it is an amount that is less than R100. Well iv checked my statement and demand that money back into my account. Regards, Modiegi