URGENT RESPONSE NEEDED VERY UNHAPPY

I paid a advance payment only to be told African bank does not do advance payment but to call back 2-3 working days before my next due date of which they will then move the payment to the new month so that the amount in advance will reflect for July 2019.To my surprise im not put into arrears after my call to them and getting confirmation the next due date is the 26/08/2019 and there will be no arrears and deductions i was told to pay another R270 i did that today but still you arent clearing the amount due for this month.Why put me through all this trouble of paying on time and more and then waste my airtime making several calls to abide by what im told i even got a ref number by the agent who assured me of the agreement ref ***5.if this is not resolved i will have to go via the ombudsman as you are not honoring the arrangements made