Just what precisely is the dispute between RMT and Southwestern Railway?

Just what precisely is the dispute between RMT and Southwestern Railway? What is SWR management position / response regarding the dispute? So many people this week will be affected, inconvenienced, lose money, be late for essential business meetings etc. etc. RMT seem just to be able to announce a strike with no or little public view or scrutiny. How can we, the travelling public raise our profile and have a voice in this? Enough is enough.