Wage reporting when hours change weekly - what worked for you?

I work some days through a staffing agency while still certifying. There are 12 people counting on me, so I am trying to be careful. Sometimes my paycheck is late by a week. Who can I ask without risking my claim?

Thanks for writing this out. I went through something close to it 12 months ago, and it got easier once I kept a simple log of every call and form.