Faulty Tom Tom navigator device

I purchased a Tom Tom navigator in March 2017. It began freezing and wouldn't charge. I then returned it to the store and it was sent for repairs. They repaired it but now i am still having the same problem. My warranty is for two years. I was told to do updates on the device to make it work. How must I do updates of when I plug it into my laptop the device will not turn on. At the store I was told that all game products at most last one year and I should be happy this device worked for so long.