I apply visit visa for my mum. We are British citi...

I apply visit visa for my mum. We are British citizen my wife, son and doughter leaving London last 17 year. I have apply visit visa to my mom and they refuse. Reson given she will not going back thire own country. My dad is not traveling with my mom and she is 64 years old. This Delhi U.K. Embassy staff need proper training from U.K. Government. One thing I want to say I am not from India. But my self and my Indian friend apply visa and Indian friend parents got visit visa but I can't. we make all support document exactly same application.
They( Delhi embassy) looking for country and then they decided. If you are not from India you will very rare to get visa. Same on you Delhi uk embassy staff.