MTN is a **** and very unprofessional.

I opened a month to month account on the 25th of July 2024 online, I paid on the online payments gateway the amount of R525 (pro rata + August payment). I am now informed that the payment I made is “retuned, reason not provided “. Im being told that I should make a payment of R800. (Pro rata + August and September payment). My bank has confirmed that no money had been returned by MTN. I have proof of payments for the money I paid. Im being transferred from department to department, trying to prove that I made the payment and my internet should not be cut off. MTN is a **** and so unprofessional. The call centre agents are not even helpful. Can i get assistance with the payment update or get a refund so I can look for another service provider. I have suffered enough with MTN