Danish,

I don't think you're doing anything wrong, but I suspect your expectations are higher than can be met with a carbide sharpener. As I note:

"Tungsten Carbide sharpeners also will do the job, but don't leave as keen an edge as a fine diamond or ceramic sharpener. These sharpeners have a pair of tungsten carbide pieces arranged so a vee is formed, through which you draw the blade. In fact, they do a pretty crude job, relatively speaking, but they are very effective and pretty much foolproof, both worthwhile attributes. In general I am not enamored of these sharpeners."

I carry the Sterling as a field expedient sharpener because it is effective and is compact and as I often say, if it isn't with you, it can't save you. Like all carbide sharpeners, it does not leave a refined edge, but it will sharpen a dulled knife so that it can be useful again. I apologize if I wasn't as clear as I might have been and will be adding a bit more on the subject vis-a-vis the Sterling to make this clearer. You will note that in my larger kit I carry a small GATCO Micro-X sharpener with ceramic rods. Both room and weight are less of an issue in that kit. My pockets can only contain so much. Any field sharpener is a compromise between size, weight and effectiveness.

You should be able to put a fine edge back on your Sebenza with a good stone, diamond or ceramic sharpener. If you are not up to the task yourself, likely there will be someone in your area who does this professionally or you can send it back to CRK and they will do so for a small Shipping and Handling charge.