A Saudi prince is being sued for millions by Boston Children’s Hospital, CNN reported.

A complaint against Prince Abdelilah bin Abdelaziz bin Abdulrahman Al Faisal Al Saud and Dr. Hamdy Dawoud, the personal physician and representative for the prince, was filed in the federal district court of Massachusetts. It says the defendants owe $3.5 million—and growing—in unpaid medical bills for a 2-year-old girl whose care they had agreed to sponsor in full.

The girl has spinal muscular atrophy, a rare disease that requires lifelong treatment. She has been in the hospital’s care since November 2017. But since then, the prince and his representative “have paid only $750,000 toward the patient’s care despite repeated promises that additional payment will be forthcoming,” the suit reads.

That first and only payment was made in December 2017.

But in the many months since that initial payment, even as care was ongoing, the hospital has been unable to collect further payment despite continuous efforts by hospital officials and repeated promises that wire transfers were scheduled, according to the suit.