1. What should we do if we don't get paid after do signature-ad campaign
should we give negative trust / not
2. Some provider in my country use Dynamic IP (the IP changed every time we connect to internet)
What will happen with my account if i got banned IP ?
And i think you should add post/activity, example : you become member if you have 60 activity
Trust system is not moderated. You can give positive or negative trust, there's no problem as long as you don't spam trust system. In this case you should write why they didn't pay you in a post and add that messages link for Reference.
Forum ranks are written in here: Forum ranks/positions/badges (What do those shiny coins under my name mean?)