Rude service and lines being after off when I made payment 4 days before due date

I made payment for my mtn account on the 29th July 2023 on the mtn app. I keep getting messages that I haven’t made payment and today my out going calls have been suspended. When I called in I’m told that I need to send a PDF proof of payment, which their mtn portal does not provide, you only get a confirmation email from paygate. I spoke to Sive matomane who was very rude when I asked how soon my lines will be activated after I send my bank statement and she said “72 hours as you are not the only customer at mtn” when I asked to speak to a supervisor she told me “I can take your number they will call you when they have time as you are not the only customer and they are busy calling other customers who have more important queries than yours”. I don’t understand why I have to wait 3 days to use my lines when I made my payment 4 days before cut off date and it’s not my fault their system is seemingly faulty