Question about Sony WF-1000XM3

I can't get them to work. It's the 2nd pair I ordered that doesn't work....... I've put them on charge with a 230v plug + the cable supplied and they don't seem to charge. As soon as I take the headphones out of the case, they switch off. And inside the case the LEDs flicker.... I don't get it. And as I said, it's the 2nd ones that are doing this to me!