Credit record ruined

I requested that a debit order should be done on the last working day of each month, However I have been receiving smses for the past 3 months that I am behind with R9+ of which I do not understand how I could be behind with R9 for the past 3 months where as they are supposed to be debiting the correct amount to bring my loan account up to date, this has ruined my credit record as it shows that I am in arrears for the past 3 months. Last month I called and requested that they debit the R9 and the agent I spoke to confirmed that it was going to be included in my monthly instalment I do not understand when I receive the same sms again this month, Honestly it's irritating.