Hi Kanwar,
Yes, I think they are right, I have this phone and once tried to replace only the digitizer, the LCD and digitizer are fully glued together and I think it is almost impossible to take them apart without bricking the LCD. even with special screen heating tools.
So I broke my LCD and now bought another LCD+Touch bundle and today I will replace it easily.
I think you should accept this fact and buy a new LCD bundle.
I hope you wouldn’t pay for a digitizer and my experience help you.