Poor service for chatsmed Hospital - all i need is a hospital statement

My son was admitted at the Chatsmed Garden hospital.I had to pay a co payment in order for him to be admitted. A CT scan was required to be done by his specialist and that I also had to pay a co payment for. he was hospitalised 3 weeks ago and I havnt received the hospital bill yet even though I phone the hospital number I am put through to every dept but the accounts dept or reception. this is not acceptable as I need to do a claim for the extra costs that my med aid didn't pay for and time is running out.