Hi Anil,
We faced a similar situation last year, though our products are loose diamonds & jewellery. Though same products are available in marktet, yet none of the genuine or old sellers copy the same title/description or list it for Re.1/- or Rs.5/- less.
The seller who harassed us was new at that time, though a powerseller now (will not like to mention his seller id, though if he'll be reading this will certainly know), he copied the title, the whole description & listed the items for Re.1/- or Rs.5/- less, we lost a lot of business, because with 800+ listings, we just couldn't revise or keep a track for such a small difference. We ran from pillar to post, TnS, account manager, category manager, but no help. Finally though tedious, but we did the same thing as that seller & finally a lesson was learnt by him. As he was a new seller & we were 500+ feedback powerseller with 100% ratings, thus his sells not only dropped but stopped.
He finally had to start thinking & apply his minds. Well, he is doing great now & no issues. Hope this can be of some help to you.
Best Regards,
MJDiamond1