Employee does not know who pays the money

Whilst I have not been paying my full installment, I paid about 70%. Last month was going to be my final installment. I was quarantined for 3 weeks last month with covid complications. I wrote an email last week that I will only be able to settle this month. Outstanding R1021 as of today. You know interest. But since then I have been subjected to a bar age of emails and sms. I then rep**** very nicely to please stop the aggressive and vexatious messages. Someone at clientcare thought it will be a good exercise to goad me even though they knew exactly what they were doing. To the point where I told them to f*** o** and hand me over. This is disgusting behavior as I already made arrangement in my lucid email and call. Yet here we are, your spoilt employee deciding today is the day to belittle my circumstances to we will hand you over. Really? Is this the type of caliber of employee that chases away your clients with petty emails. Covid19 has exposed all the fault lines. With this type of employee you will go down. It's not as if you make space rockets. Anybody can lend money. You are not in a position to fight with a client who has 1 more installment to go. All you did was alienate me now, forever. Maybe the employee does not realize that the interest and all other excess payments I make, goes to his or her salary. I will settle around 26th August. I was your client