Struggle to get debit order sorted

It seems like such a mission to simply update my banking details and run the debit order. My debit order is suppose to run on the 1st of every month from my Nedbank account. My debit order still has not gone off. This is the second month in a row that I have to remind them to collect their money - this should be a simple task. Get it right. Every time it costs me to phone me because they can't get it right the first time.