LG CHEATED ON TV SPECS

LAST YEAR I BROUGHT 65 inch NANO CELL TV on the box it says 65 inch on my slip is says 65 inch and for a while i noticed that when i see other 65 inch tv it look bigger than mine but thought i imagine things ,i also even contacted LG on the customer care whatsapp line and told them why does my 65 inch are smaller it is 146cm in lenght where they advertise it is 165cm long but got no answers ,NOW I REALLY FEEL LIKE I BEEN CHEATED OUT BECAUSE IM STUPID and dont know TV ,i really would like to get what i paid for