TS, if the racquet is confirmed to be a fake/imitation, do consider making a police report if you have not. Else he'd just ignore and continue his 'original product' sales.

It'd help the case if seller had posted proper, detailed explanation on the specific racquet instead of messily throwing information in his FB but I guess he simply isn't bothered about it.

Good luck TS, hope you can get a refund at least. Am a badminton player myself (though super noob), so am very sad to see this kind of problem happening