"Knee operation "

Had a small torn cartilage in my left knee, had an operation on it March 2013, which was done without having an MRI scan or anything by a Jr Dr, months of pain after it they lost all my records so still not seen them, was operated on again to fix it in November 2013, still not any better, went back in January to see a doctor in January this year, told me my cartilage was shattered and had to have a part knee replacement or a full knee replacement, told me it would be 3 months, I keep phoning up but still cant get a date, even my Gp has written to them telling them what its doing to to me, cant take much more please help ..