@simonkey , simone , link below shows how to replace the broken display on 6S and a link to a replacement display assy., which you can also do a search on for better pricing perhaps. When phone is apart you will have to visually check to see if other components are damaged also. If not comfortable attempting repair have a good local cell phone/computer repair shop have a look and estimate repair. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
iPhone 6s Display Assembly Replacement
iPhone 6s LCD Screen and Digitizer