Iwatch series 6

Please help. I have my iwatch series 6 and had it for a month. The screen is completely black though i can still hear the sound for charging and vibrations. I tried for force reset several times but its not working. So what I did is i tried to reset it on the app in my phone and unpair. And now the screen of my watch is still black and i cant pair it with my phone. But i can still the vibrations whenever i press the side button. What will I do with this!? I need your help.