That sucks, happened to me too so my scroll wheel was broken till I got a new mouse, I just binded my action key to one of the side buttons on my mouse.
I ordered a G502 Proteus Spectrum Gaming Mouse EWR2 should be here thursday.
@Fedot I know how to fix it i just have to glue the small pin that broke back on or drill a hole through the wheel and make a new pin but i don't want to do it.