How do you report hours that vary week to week?

I picked up part-time shifts as a bank teller and I am confused about how to report them. It has been a long 20 weeks. Sometimes my paycheck is late by a week. Who can I ask without risking my claim?

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.