Extended warranty not offered upon purchase

I bought a Telefunken 55" at Game Lenasia about a year ago. The device switches off every 30 minutes and when I called the outlet they informed me I should bring in the unit as it has 2 years warranty. When I got to the store on Saturday the 25th September I was then informed the unit is no longer under warranty, as it ended in August already and I should have purchased extended warranty. By the time I bought this device I was never offered an extended warranty. The VAS should be offered to customers, because we as end users are not informed by sales people until we encounter issues with the products. If the extended warranty was offered the time I bought this unit I would have included it, however, I was never informed. Please advise how do I go about resolving this as I was not informed at inception of my purchase.