The published rule and the enforcement pattern are different documents. Only one of them affects you.

It gets smaller. Not easy, smaller. That distinction kept me going. Not on a documentation request but the pattern is familiar.

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

An inconclusive account is useful if it stops the next person mistaking a story for a controlled comparison.

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