The gaslighting comment really resonates with me. It's one of the reasons why I find the push to paperless everything a little disquieting - sometimes I want to keep records in case my dispute is with the record holder!

I had an issue with a credit card company a few years ago, in which I had to request a new card. Apparently, as part of the new card issuance, they also "helpfully" moved my payment due date -- which I found out about when I received a past-due notification via the mail. Had I not had a paper statement with the correct due date on it, I probably could have been convinced that I had just missed making a payment, especially as the initial customer service representative insisted there was no way a new card could change my payment due date. Only after escalating a couple of times were they able to figure out that I in fact hadn't requested my monthly cycle only be 18 days long.

Now my wife makes fun of me because I still receive and file away paper statements, just in case.

Edit: removing names since it's not relevant to the story.