Yesterday, I faxed some stuff to the bank.

Today, I called them, as I hadn't gotten any response from them, so I didn't know if they got my fax. They said they hadn't received anything from me.

I re-faxed the items this afternoon. They called back, asking why I hadn't faxed anything yet.

Third try: I realized I had been putting the paper in upside down and faxing blank sheets of paper.