Paid for a 55 inch TV and got a 48 inch delivered

I purchased an LG SMART Tv (Model: 55LB65) from your store over the weekend.<br> It was delivered to me yesterday.<br> <br> The size of the TV is supposed to be 55 inch's (139 cm) as per the advert/info in the store and on the box.<br> I note however that the actual size of the TV is 123 cm's (48 inches)<br> <br> Please advise on discrepancy?<br> <br>