Return it to the guy who sold it to you.
A few years ago I visited a place of someone who was selling these TVs. All TV were unbranded means nothing was written on them and the guy said he can print all the labels/stickers including box of any brand we wanted.
I dont know how you bought it but anyone can spot that its a fake just by holding its remote.
You can keep using it as Ive seen some of these installed at shops and they run all day.