Wage reporting when hours change weekly after 17 years as an operations analyst

I picked up part-time shifts as an operations analyst and I am confused about how to report them. 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 last year, and it got easier once I kept a simple log of every call and form.

Keep everything in writing and save the confirmation numbers. It saved me later.