unappreciated attitude from call center

I received a call about my account being in areas. I was supposed to pay 1200 for month end of November but I paid 900 which puts me in areas of 300. I received a call from a very hostile call center agent by the name of Monique in Cape town who insisted I should pay 1500 today (18 December) or 19 December which is inclusive of the December installment due beginning of January. The agent was very impatient with me when I wanted to understand why the entire amount now and not the arreas now and the instalment in January. As much as we are responsible for our instalments we also expect respect and proper professional conduct from the agents who contact us about our debts. I have never experienced an attitude as badas that since I was a client of totalsports and in all hhonesty, this is the kind of attitude that drives customers away from brands they are supposed to be loyal to.