TomTom Runner 3 doesn't turn on
I bought my TomTom Runner 3 in june 2017 to run a marathon and training to an ultramarathon in october. Since then I haven't used my watch. Yesterday I tried to charge it, but, after 8 hours, it did not turn on. Nothing appears on the screen. What should I do? I pressed all buttons for 15 seconds, but nothing happens. This watch is almost brand new!!!