Worst company to make payment arrangements with

Worst company to make payment arrangements with. My mom's got an account with them due to personal reasons she couldn't afford to pay the full installment but made arrangements to pay R300 pm not once has she been late or skipped a month but they keep on harassing her and threatened to hand her over to the attorney. What is the point of having a payment arrangement then? Honestly if my mom could afford to settle the account don't you think she would just to get you of her case. Really you guys are pathetic harrass the people that don't make any efforts to pay their account.