Harassment

Why am I being harressed with phone calls and sms regarding an account that I paid and sent proof of payment over and over I am using the same email address that the agent tells me on the phone Please get you admin in order Dear MRS F JARDINE Reminder for Payment to Lancet Laboratories (DRS Mauff A C & Partners). Please Pay R43.04 to Nedbank Acc Number ***, Branch Code: 146905 and use M***9 as reference. Should payment have been made, kindly email your proof of payment to *** with SUSP POP in the Subject field.