LANCET ACCOUNTS DEPT WILL NOT RECTIFY THEIR ERROR AND ARE THREATENING A 88 YEAR OLD LADY

I can't even give them a 1, but there is no allowance to give them a zero. They have charged my 88 year old mom twice for the same test, and refuses to let us speak to the accounts department. Call centre pathetic and won't give us an e-mail address to the accounts department. The medical aid won't pay as they clearly state on their account that it is a duplicate invoice therefore they won't pay and my mom must not pay as it is clearly duplicated. My mother has received threatening calls and basically a daily SMS threatening her. She has never in her life received these type of correspondence. She is besides herself with worry. Even several requests for a detailed invoices and statements none has been forthcoming from Lancet. Even after giving them two e-mail addresses. Can anybody please assist my mom. She is not healthy at all, and this is eating away at her.