Appointment not kept due to valid reasons

Morning please be advised that your statement for appointment not kept please make payment as soon as possible or the account will be handed over to the lawyers, this is the message sent by Dr EM Swart threatening me to pay the amount of R1800.00 due to arriving late on the dental appointment, and she told me that I have signed for that claws, even if is the case, this is unfair treatment by the Doctor, her practice number is (***)<br> <br> <br>