Consumables added to Bill the next day

While I'm happy with the service, it's extremly frustrating to be charged another few Rand the following day of my consult and now be liable for that. Rather, present the FULL & FINAL bill at the end of the consult like every other medical practitioner does!

My daugher visited the doctor in Demember & we paid before leaving the premises. The next day, another R16 consumables is added which I now need to transfer / drive to the practise ?

It's extremly frustrating and it's never happened in all my years visitng the doctor . y