Re the cost
A properly organisd dept wouldn't need to spend lots of time running around, all it needs is proper organisation and planning (and no super duper it system is needed) just an organised way of doing and rcording.
But the people n power have no desire to be organised as this gets in the way "doing budiness"
So the excuse of cost would be nonsense if things were properly organised.
As a former auditor we woule send out requets to companies suppliers/customers for debtor/creditor info. Most would respond but you could guarantee that local/national government would respond saying they didn't have the records