How do i tell if its a real or fake brand?

Where did you buy the product? The vendor you bought it from must be able to vouch for the authenticity of the product, if you have any doubts do a google search for the head office of the shop you bought it from or contact the vendor and ask them to provide invoices from the brand or the distributor for their region, these invoices should have their company logos on them. Any fake or counterfeit goods are normally sold to vendors from fly by night organizations who do not put a name or any real company details on their invoices or company documentation. Their are a lot of good fakes out there and the brands are having a tough time keeping up with them.