Water Administration

Drinking water is delivered to us in containers of 19 liters that we order regularly (in Russian!).
It used to be the four containers delivered by two strong men who took the empty containers with them, had us sign a little form and left the signed receipt with us.
Yesterday, another delivery. As a result we were left with 5 (five!) papers:
The usual one, another one stamped and signed, also stating that 4 containers were delivered.
A third one reading "invoice", also with stamp and signature.
A fourth one with stamp and signature and finally a fifth one (also with stamp and signature, of course) detailing the taxes paid for the water and the delivery.