Written confirmation email after every phone call. Cheapest insurance there is.

Print the page. Not on the signature field but the pattern is familiar.

Photograph everything before you open it. Ten seconds, settles most disputes.

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

Test one thing at a time. It feels slower and it is the only way to learn anything. Same for me with CJC-1295, unfortunately.