Terrible service - Makro Credit

I received my makro statement on the 15th of February 2020. I then decided to settle my account and close it. I paid the outstanding amount and called them to cancel my account. They informed me that payments take 4-5 days to reflect, and I should call them today, 21st of February, and they will close it. Now that I phoned them, they told me they can't close my account, because suddenly there is another R 1 000.00 outstanding for a purchase that I made on 01/12/2019. That was 3 months ago. This is absolutely ridiculous!