Refusal to change payment date

I have never experienced such constant bad and unprofessional service like I have with Debtbusters. I recently secured a job abroad, and before my departure I called in to change my debit order date. I was told to provide a payslip. In every job I have worked in a payslip is provided after you have worked. THis now being a job out of South Africa, my contract layout is different and does not have a pay day. We were informed via conversation that it will be on the last day of every month. Here I am asking to change the date to the 5th to give the finance time to be moved from international account to South African account. But no, debtbusters is refusing to allow me to pay my debt. Ai no. Every single time I must deal with debtbusters it is a nightmare. I have to pray in tongues. How am I being refused to change my payment date, like I want to pay my debts yet they are blocking me from doing so.