Bad Attitude/Sending statements to incorrect e-mai

On the 10th of Sept my husband went for a minor surgery. We received the first statement from Dr Murfin's offices from Sue Minnie. Thereafter we heard nothing again. This morning she contacted my husband and behaved very hostile and demanded money. We then noticed that she was sending statements to the incorrect e-mail address. They are still willing to allow us to pay the discounted price as it \was her fault"but it needs to be done \""Before the end of the week\"" and \""the onus rests on us as the consumer to make sure we receive statements\"" Why must we be treated so hostile by a woman who made a mistake and this is now the result. I called her she is extremely rude "