A summary statement, an itemized statement and an explanation of benefits are not versions of the same page. Here is what each one can prove, and which to request first.
Most families use all four and rarely decide the proportions on purpose. The order they are drawn on changes the total cost of the degree considerably.
Several different deadlines run at once in any disagreement, set by different people for different reasons, and the earliest one is usually the least advertised.
Most small operations know the total for the year and nothing about which work produced it. The difference between those two facts is usually an entire category of job.
The four year degree is treated as the safe choice and the thing to do while undecided. It is a large commitment and it deserves to be chosen rather than defaulted into.