Sir
seems to me like your syncromesh gear selector forks are worn out,
ask any mechanic, any competent good mechanic and tell him in desi language thats the rings , "Ringoona Check ka"
im sure that will sort it out, your gearbox will have to opened and rebuilt, but hey thats the price you have to pay for gears that shift like a knife on butter (man im hungry)lol
take care