Rude Credit Controller

In January I part paid my account by R900 , I was fully aware of that and as I was getting bonus in February I was going to pay my monthly installment and the arears the moment I get paid. I have been paying my account every month , some months I pay more than my installment , not have I missed one payment. I was fully aware of my bill not being paid in full , I get a call today 23/02/2021 by a very rude lady telling me I need to pay R700 today or tomorrow. I then stated to her that in my sms I received I was given until 01 March to pay , she then stated that my account is in arears , where I said I know and it will be paid by the 25th of Feb , my installment and the arears. She then put the phone down in my ear. I think this is very rude and unprofessional, I myself am a Credit Controller and I know very well that an account that is less than 30 days you cannot threaten the person to pay before they make an arrangement. I am a loyal customer and I want to believe that they see that on my records , why be so rude before you even hear my side of the story. If my account is 120 days in arears then by all means be rude if you must , but not even 30 days , that is just unfair.