​Client wants to see a full breakdown of costs… after paying the deposit.

I did a job for a corporate client a month ago, job is complete and ticked off. They paid a 50% deposit in March, and the remaining amount is due within 60 days of the work being completed. Full invoice shows what I’ll provide and what the finished output will be. Now the remaining amount is due, they’ve asked for a FULL itemised breakdown on staffing costs, editing time, additional costs etc…

I want to just say no, pay the invoice.

Anyone ever had this before?