Customer pays an extra charge ($) for using a thing over time. Unlike some customers this charge isn't broken out separately anywhere is and actually it is hidden in an overall bill / number they receive that is just a non itmized sum of a bunch of stuff...

They want an accurate number.

This request came up in a meeting and it was so bonkers that it had to be repeated like 8x ;)

The repetition isn't so bad really as at least it indicates everyone was all "uh wait wut!!?!?"