Bought a decoder in December and by the 12 February its not working

<p>i purchased a decoder in December 2016 and on the 12 february 2017 it has stopped working, when i called the call centre they said they would reset the password. when that didnt work i was told that i needed to take it back to the store. once taken back to the store they cannot do anything as they cannot see the writting on the receipt. please can someone assist me, I dont think its fair to spend R350 for a product to last less than a month.</p> <p> </p>