As Seda mentioned, "keep telling your story". This is also known as the "broken record method" and often does work. It is also a good idea to be friendly and appreciative with office staff, nurses, etc. or anyone connected to the surgeon or others in charge of treating your sister. Get their names so you can address them personally or mention them favorably to others. Impress upon them the urgency of continuing treatment and how concerned you are. A few tears may even help as well. Ask if there is any way at all that treatment can be established or continued. When my son was undergoing treatment, he had no health insurance, no job and in the middle of divorce. One of the nice assistants at the office put us in touch with a drug company that provided free meds based on need and suitability. The hospital set up a payment plan where we could pay a very nominal amount to each department billing us, some as low as $5 or $10 a month! There are people who do care and when they see how sincere and concerned you are, they will help or will point the way to those that can help.