Heart disease and Job. What should i do?

I was operated for Congenital heart disease - Subaortic membrane resection in Feb 2015. I cleared an interview for a job in Dec 2016 which involves software development and application integration. During my medical examinations , doctors heard a murmur in my heart and asked me about my cardiac history . I explained to them everything and showed them my 2d echo reports which I had done recently. It showed mild AR and AS which is normal considering I was operated. They told me to meet their doctors in their hospital and get a 2d Echo done from there and their doctor wrote to the company that candidate will require surgery in few years .HR and the doctors of the firm told me that I cannot be considered for the job because the job involves extended hours and stress. My cardiologists and surgeons have told me not to do only physically strenuous job and have given in writing that I can do my routine work with limited exertion. What should i do ?