Hairline crack on Touch Screen Digitizer of iwatch series 2

Hi Experts,

I bought my apple iwatch series 2 last month. Yesterday while walking down the street my hand collide with another person's hand. May be he was wearing some hard metal watch. Few time later I noticed some hairline crack on the touch screen digitizer. Though the touch is woking but I guess force touch is no more working. I want to know is it repairable, if yes then what is the best way and how much it costs? Since it is working how could I protect it so that the damage won't expand and iwatch touch become non functional :( . Please suggest. Thank You in advance.