Bad customer services

Service is bad from client service to finance. I requested a settlement for a contact that was suppose to end in Aug 2022 because my goal was to manage my finance better. I could not pay for the new phone and this old contract, they confirmed settlement is R2100, this amount was paid on the 7th Feb 2022. And I followed up mid February to confirm if the money is reflecting and also reiterated why the is that kind of credit but telkom decided to not allocate the money to settle the old account but to allocate it to monthly instalments for Feb. What I was trying to avoid now happened they allocated the R2100 to my old and new contract monthly installment and then closed my old contract. So now in Feb I look at my bank statement and I see no debit order , surprised by monthly statement that said March debit order is R2287.80, this threw me off. When I called I was on the phone for atleast an hour before I got an explanation. If telkom had allocated the money paid beginning of Feb correctly I would have been on the correct installment instead I am with a bill that is times 2 which affects my budgeting and negatively affects my other debit orders and holistically my credit scoring. Telkom should actually go back and rework their allocate then they will see that I should actually have a credit.