I have a pair of stereo headphones, I got them on Amazon.

Now, the right headphone stops producing sound. To fix that I need to move/shake the tip of the cable (the one before that part of tip which goes inside the headphone jack on the laptop).

But as time goes, this sort of fix helps less and less. It looks that the cable is a bit broken at the place where I shake/move cable.

Is that the end of use of my headphones? Is that a reject of the device? Is there a way to fix it, for example, changing the very tip of the cable at the very end of it. Any advice on buying headphones?