Debit order change

I app**** for a home loan with absa and it joint. Upon application we stated that the debit order must go through from my husband's absa account and not my account. 1st debit order went through in March from my account luckily I had money. We called Absa they said we must fill the forms to change it and we did exactly that and was promised it will run from the correct account. April I went through from my husband's account which is correct. Comes May the tried to debit me and I got charged R110 because of that. I called again they said they have fixed it. June again from my account and another R110 I got charged. Is it that difficult to change the debit order from one account to the other? Why must I always pay R110 when we going through a difficult time like this. Now I don't know what to do anymore and these R110 are bread for my kids ??