Emergency colorectal cancer surgery for my father

My father is a colorectal cancer patient.he had his radiotherapy and chemotherapy for during the month of January and February 2018.He now needs surgery asap or else the cancer is likely to spread.The radiotherapy and chemotherapy were covered by insurance and the insurance is demanding about 150,000 Saudi riyals from the company my father works in.The company is unwilling to pay and is threatening to fire him without any treatment. Please you are my last hope.My father worked all his life to provide with the best if all things to both his daughters.I don't want to father to die because he doesn't have money. Please help me to save my father.