Bad service

I have been with Vodacom for 9 years now ,I have never missed any payment or anything but today they feel they can’t assist At the beginning of the month I migrated my tariff plan due to it being high,I received my invoice and I saw that that money I won’t be having For the first time in my life I called Vodacom to ask if I can make arrangements like maybe pay half and finish the other half next month I was told they can’t assist I need to wait for my debit order to bounce and cause more charges for me then I can make an arrangement Who can I rely on ? Today you guys feel you can’t help Can’t wait for this contract to end