LG Electronics — New TV Fraud

Hello sir,
i went to purchase a brand new lg c2 48 inch oled tv from lg brand store, i made the paymet and the store manager said that he will deliverthe tv next day, after a day a guy came from lg electronics and installed the tv.on the same day i found out that the tv isnt brand new, its a 6months old used unit used for 1500+ hours, so i rushed to the store and said that its not a new tv firstly they deied, after i provided proof the store manager said that yes i gave you the display unit so i asked for a replacement as i didnt paid for 6months oldtv, i paid brand new price so i should get a brand new tv, but he deied to replace the unit and i asked why and he said there is no reason we simply cant replace the unit.so basically he fraud me, please help me get a brand new replacement.i have every kind of proof from call recording to everything that indicatd that the tv i got is a used tv.