Standard bank refund dept

After making arrangements for debit order on my bond payment,they actually still deduct every month a double payment then I need to wait 7 working days for refunds.First month they excepted a mini statement this month they can no longer except a mini statement.On the 3rd the refund was approved today they send mail to ask for not a mini statement but rather a monthly statement,do they know that I have to pay for it when they are at fault