stop harrasing me

I am paying my sons school fees via the lawyers, in which I don't have a problem. I made arrangements for R1000.00 every month, in which I am paying, then this women Simmi is always harrasing me she is always phoning me 2 days before pay day till the 15, as if I don't know, what I don't also appreciate about her is that I told her that she must email me if she needs anything , she is just harrasing me she phones 10 times a day, also she wants me to pay more then what I can afford also she is refusing to send an updated statement she said I will only get that if I need to do a settlement on my aCcount, she is racist, because I am black she thinks I am stupid, simmi we r not frends I am tired of u, I know I have to pay on the15 of everymonth of what I can afford I know my rights. Simmi stop doing what u r doing, is it because I am not an indian