lan port on qled 55inch tv not working

i bought a samsung qled 55inch tv and the lan port does not work. samsung send me a techician who know nothing, he fiddled with my router and says i must replace the router and its unstable, he did not test anything only came with a *****driver , i phone them to tell i am not satisfied with the techician then they reloaded my claim and again the sent me the same techician after telling them i dont want him, second time he only took photos of the error message and i had to plug in my computer to proof to him that the modem and lan line is working and if connected to tv it does not work. then he want to take the tv to workshop without bringing the tv box and packaging , i refused as i think he is not qualified to fix my tv. i ask samsung to replace my tv which the refuse to do so. all my equipment is samsung = 4 cellphone, washing machine, microwave, dvd player, sound system. this is the treatement for being a loyal samsung customer. samsung tel no. *** ref *** cell no ***. i will never ever buy another samsung product JOE SOMAI CELL *** EMAIL ***