Thanks Hari for this informative post. I have bought a new Gama Kuyil and am facing the 3rd issue captured by you. I will try to remove the feeder and nib and refit the same and try. It would be nice if you can share any prior experience with this pen.
Ganesh, contact the seller for replacement pen/repair. The nib and feed fit is an excellent fit on my example of the Kuyil, I am very happy with the pen. You may PM me if you need further tips for debugging your pen.