Terrible after-service

I bought Hisense Washing Machine in 2013 and also took extended warranty. The machine packed-up in August 2017 and the store is taking me from pillar to post when they have to repair because I did not have the receipt. The store manager is forever unavailable despite leaving dozens of messages. I decided to call Dionsure Warranty extensions and to my suprised, I was told that the extended warranty was cancelled a month after. It is shocking that it has been a month since I reported and no one has even called despite going to the store, calling multiple times and leaving the messages and sending emails.