Walmart charging every pickup for partial refills.

Hello. I hope this is the appropriate place for this question.

My local Walmart never has my medicine in stock, so they always give me partial refills. It’s annoying but I’ve always been nice. No big deal.

Well now I’ve switched insurance and I’m supposed to pay $10 for a monthly refill.

But since they only ever have a handful of pills, they have me coming in every few days and charging me the $10 EVERY TIME.

The lady at the counter is very rude and I just don’t know where to go for information.