Vivomove hr screen turned black

I got a garmin vivomove hr watch 

It was working fine but after few months of use it's screen started to turn black from sides it started to expand and in the end took all over screen.  It's been 1-1.5 year since it turned black timing is not set and I am not able to change time or even reset it cause I can't see anything on watch tried few shops in india even in Canada and no one is willing to tell me the root cause of problem or solution of this problem