Hisense makes no sense!!

I purchased an apartment fitted with new appliances - one of the appliances is a Hisense refrigerator. <br> <br> On returning from a recent holiday I discovered that the refrigerator had stopped working. <br> <br> After viewing the Hisense webpage warranty conditions I called the Hisense customer service line. Gave them my details and the details of the appliance, which they acknowledge still falls within the 3 year warranty period for that particular appliance, however, they will not honour the warranty because I do not hold the original invoice.<br> <br> The seller of the apartment has since moved to the UK and I have no means of making contact with him. <br> <br> The point that I am trying to lobby is