PATHETIC AFTER SALES SERVICE FROM HISENSE

I purchased a Hisense Fridge/Freezer and have been trying to register the 4-year warranty. It is impossible to achieve this on their website. They also provided an email address *** that one could do the registration. The response has been pathetic. They asked me for a serial number which I could not find. I asked them where I could find this - NO RESPONSE. I sent them pictures of EVERY number I could find on the Appliance and the packaging and still NO RESPONSE. Eventually I was able to work out which number was the serial number after several attempt on GOOGLE. I sent them the number and requested confirmation of my 4-year Warranty Registration - still NO RESPONSE.