Small wins count. Walking to the mailbox is a data point.

Written confirmation email after every phone call. Cheapest insurance there is. How long have you been on a chargeback?

Small wins count. Walking to the mailbox is a data point.

Enteric coatings should not be crushed. The pellets are the delivery mechanism.

I would stop trying to convey how bad it is and start saying what you want them to do.

Bring a list. Embarrassment makes everyone forget things, including you.

You are not imagining it and you are not being difficult. Document it and take the document in.